效果:http://hovertree.com/texiao/css3/19/
代码如下:
<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><span style="color: #ff00ff;">doctype html</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 2</span> <span style="color: #008000;"><!--</span><span style="color: #008000;"> W3C规范 </span><span style="color: #008000;">--></span> <span style="color: #008080;"> 3</span> <span style="color: #0000ff;"><span style="color: #800000;">html </span><span style="color: #ff0000;">lang</span><span style="color: #0000ff;">="zh"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 4</span> <span style="color: #008000;"><!--</span><span style="color: #008000;"> 声明 </span><span style="color: #008000;">--></span> <span style="color: #008080;"> 5</span> <span style="color: #0000ff;"><span style="color: #800000;">head</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 6</span> <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="UTF-8"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 7</span> <span style="color: #008000;"><!--</span><span style="color: #008000;"> 声明当前页面的三要素 </span><span style="color: #008000;">--></span> <span style="color: #008080;"> 8</span> <span style="color: #0000ff;"><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>CSS3菜单仿小米官网菜单 - 何问起<span style="color: #0000ff;"></span><span style="color: #800000;">title</span><span style="color: #0000ff;">><span style="color: #800000;">base </span><span style="color: #ff0000;">target</span><span style="color: #0000ff;">="_blank"</span> <span style="color: #0000ff;">/></span> <span style="color: #008080;"> 9</span> <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">name</span><span style="color: #0000ff;">="Keywords"</span><span style="color: #ff0000;"> content</span><span style="color: #0000ff;">="关键字,何问起,菜单,CSS3"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 10</span> <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">name</span><span style="color: #0000ff;">="Description"</span><span style="color: #ff0000;"> content</span><span style="color: #0000ff;">="描述,hovertree.com,何问起CSS3菜单"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 11</span> <span style="color: #008000;"><!--</span><span style="color: #008000;"> 样式 </span><span style="color: #008000;">--></span> <span style="color: #008080;"> 12</span> <span style="color: #0000ff;"><span style="color: #800000;">style </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/css"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 13</span> <span style="background-color: #f5f5f5; color: #800000;">* </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 14</span> <span style="background-color: #f5f5f5; color: #ff0000;">margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 15</span> <span style="background-color: #f5f5f5; color: #ff0000;">padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 16</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 17</span> <span style="color: #008080;"> 18</span> <span style="background-color: #f5f5f5; color: #800000;">.nav </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 19</span> <span style="background-color: #f5f5f5; color: #ff0000;">position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> relative</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 20</span> <span style="background-color: #f5f5f5; color: #ff0000;">width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 994px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 21</span> <span style="background-color: #f5f5f5; color: #ff0000;">height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 52px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 22</span> <span style="background-color: #f5f5f5; color: #ff0000;">background</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> #404144</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 23</span> <span style="background-color: #f5f5f5; color: #ff0000;">margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0 auto</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 24</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 25</span> <span style="color: #008080;"> 26</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 27</span> <span style="background-color: #f5f5f5; color: #ff0000;">list-style</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> none</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 28</span> <span style="background-color: #f5f5f5; color: #ff0000;">float</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> left</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 29</span> <span style="background-color: #f5f5f5; color: #ff0000;">line-height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 50px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 30</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 31</span> <span style="color: #008080;"> 32</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li a </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 33</span> <span style="background-color: #f5f5f5; color: #ff0000;">display</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> block</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 34</span> <span style="background-color: #f5f5f5; color: #ff0000;">text-decoration</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> none</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 35</span> <span style="background-color: #f5f5f5; color: #ff0000;">color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> #FFFFFF</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 36</span> <span style="background-color: #f5f5f5; color: #ff0000;">padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0px 15px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 37</span> <span style="background-color: #f5f5f5; color: #ff0000;">font-family</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> "微软雅黑"</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 38</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 39</span> <span style="color: #008080;"> 40</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li a:hover .xs </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 41</span> <span style="background-color: #f5f5f5; color: #ff0000;">display</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> block</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 42</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 43</span> <span style="color: #008080;"> 44</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li a:hover </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 45</span> <span style="background-color: #f5f5f5; color: #ff0000;">background</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> #333333</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 46</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 47</span> <span style="color: #008080;"> 48</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li a .xs </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 49</span> <span style="background-color: #f5f5f5; color: #ff0000;">border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 1px solid #cccccc</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 50</span> <span style="background-color: #f5f5f5; color: #ff0000;">border-top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> none</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 51</span> <span style="background-color: #f5f5f5; color: #ff0000;">display</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> none</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 52</span> <span style="background-color: #f5f5f5; color: #ff0000;">width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 992px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 53</span> <span style="background-color: #f5f5f5; color: #ff0000;">background</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> #FFFFFF</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 54</span> <span style="background-color: #f5f5f5; color: #ff0000;">position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 55</span> <span style="background-color: #f5f5f5; color: #ff0000;">top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 50px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 56</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 57</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 58</span> <span style="color: #008080;"> 59</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li a .xs .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 60</span> <span style="background-color: #f5f5f5; color: #ff0000;">position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 61</span> <span style="background-color: #f5f5f5; color: #ff0000;">top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -8px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 62</span> <span style="background-color: #f5f5f5; color: #ff0000;">border-left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 8px solid transparent</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 63</span> <span style="background-color: #f5f5f5; color: #ff0000;">border-right</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 8px solid transparent</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 64</span> <span style="background-color: #f5f5f5; color: #ff0000;">border-bottom</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 8px solid #FFFFFF</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 65</span> <span style="background-color: #f5f5f5; color: #ff0000;">width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 66</span> <span style="background-color: #f5f5f5; color: #ff0000;">height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 67</span> <span style="background-color: #f5f5f5; color: #ff0000;">z-index</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 999</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 68</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 69</span> <span style="color: #008080;"> 70</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(1) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 71</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 20px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 72</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 73</span> <span style="color: #008080;"> 74</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(2) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 75</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 98px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 76</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 77</span> <span style="color: #008080;"> 78</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(3) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 79</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 177px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 80</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 81</span> <span style="color: #008080;"> 82</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(4) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 83</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 255px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 84</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 85</span> <span style="color: #008080;"> 86</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(5) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 87</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 348px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 88</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 89</span> <span style="color: #008080;"> 90</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(6) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 91</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 427px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 92</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 93</span> <span style="color: #008080;"> 94</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(7) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 95</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 496px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 96</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 97</span> <span style="color: #008080;"> 98</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(8) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 99</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 576px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">100</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">101</span> <span style="color: #008080;">102</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(9) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">103</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 646px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">104</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">105</span> <span style="color: #008080;">106</span> <span style="background-color: #f5f5f5; color: #800000;">.nav li:nth-child(10) .xiao </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">107</span> <span style="background-color: #f5f5f5; color: #ff0000;">left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 706px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">108</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">109</span> <span style="background-color: #f5f5f5; color: #800000;">.hovertreeinfo </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">110</span> <span style="background-color: #f5f5f5; color: #ff0000;">text-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">center</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;"> .hovertreeinfo a</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">111</span> <span style="color: #0000ff;"></span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span> <span style="color: #008080;">112</span> <span style="color: #0000ff;"></span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span> <span style="color: #008080;">113</span> <span style="color: #008080;">114</span> <span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span> <span style="color: #008080;">115</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="nav"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">116</span> <span style="color: #0000ff;"><span style="color: #800000;">ul</span><span style="color: #0000ff;">></span> <span style="color: #008080;">117</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/h/bjaf/5yh8pnpj.htm"</span><span style="color: #0000ff;">></span>首页<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">118</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">119</span> <span style="color: #0000ff;"><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">120</span> <span style="color: #000000;">何问起网 </span><span style="color: #008080;">121</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="xs"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">122</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="xiao"</span><span style="color: #0000ff;">></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">123</span> <span style="color: #0000ff;"><span style="color: #800000;">img </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="http://hovertree.com/texiao/css3/19/img/1.jpg"</span> <span style="color: #0000ff;">/></span> <span style="color: #008080;">124</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">125</span> <span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span> <span style="color: #008080;">126</span> <span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">127</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">128</span> <span style="color: #0000ff;"><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/code/javascript/8lp142er.htm"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">129</span> <span style="color: #000000;">红米 </span><span style="color: #008080;">130</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="xs"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">131</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="xiao"</span><span style="color: #0000ff;">></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">132</span> <span style="color: #0000ff;"><span style="color: #800000;">img </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="http://hovertree.com/texiao/css3/19/img/2.jpg"</span> <span style="color: #0000ff;">/></span> <span style="color: #008080;">133</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">134</span> <span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span> <span style="color: #008080;">135</span> <span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">136</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/h/bjaf/v84hu8e9.htm"</span><span style="color: #0000ff;">></span>小米平板<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">137</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/code/jquery/qmio0dq9.htm"</span><span style="color: #0000ff;">></span>小米电视<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">138</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">139</span> <span style="color: #0000ff;"><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/h/bjaf/c7d7k8te.htm"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">140</span> <span style="color: #000000;">盒子 </span><span style="color: #008080;">141</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="xs"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">142</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="xiao"</span><span style="color: #0000ff;">></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">143</span> <span style="color: #0000ff;"><span style="color: #800000;">img </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="http://hovertree.com/texiao/css3/19/img/3.jpg"</span> <span style="color: #0000ff;">/></span> <span style="color: #008080;">144</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">145</span> <span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span> <span style="color: #008080;">146</span> <span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">147</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">148</span> <span style="color: #0000ff;"><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/h/bjaf/nebj8df9.htm"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">149</span> <span style="color: #000000;">路由器 </span><span style="color: #008080;">150</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="xs"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">151</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="xiao"</span><span style="color: #0000ff;">></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">152</span> <span style="color: #0000ff;"><span style="color: #800000;">img </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="http://hovertree.com/texiao/css3/19/img/4.jpg"</span> <span style="color: #0000ff;">/></span> <span style="color: #008080;">153</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">154</span> <span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span> <span style="color: #008080;">155</span> <span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">156</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/h/bjaf/a1wnr9gs.htm"</span><span style="color: #0000ff;">></span>合约机<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">157</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/h/bjaf/kqud99m6.htm"</span><span style="color: #0000ff;">></span>服务<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">158</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/h/bjaf/0i85qaml.htm"</span><span style="color: #0000ff;">></span>社区<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">159</span> <span style="color: #0000ff;"></span><span style="color: #800000;">ul</span><span style="color: #0000ff;">></span> <span style="color: #008080;">160</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">161</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="hovertreeinfo"</span><span style="color: #0000ff;">></span> <span style="color: #008080;">162</span> <span style="color: #0000ff;"><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/h/bjaf/xiaomimenu.htm"</span><span style="color: #0000ff;">></span>原文<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com"</span><span style="color: #0000ff;">></span>首页<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://hovertree.com/texiao/"</span><span style="color: #0000ff;">></span>特效<span style="color: #0000ff;"></span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span> <span style="color: #008080;">163</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">164</span> <span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span> <span style="color: #008080;">165</span> <span style="color: #0000ff;"></span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
转自:http://hovertree.com/h/bjaf/xiaomimenu.htm

HTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese

The alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.

ToinsertanimageintoanHTMLpage,usethetagwithsrcandaltattributes.1)UsealttextforaccessibilityandSEO.2)Implementsrcsetforresponsiveimages.3)Applylazyloadingwithloading="lazy"tooptimizeperformance.4)OptimizeimagesusingtoolslikeImageOptimtoreduc


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