第一段代码
<div> <ul style="list-style:none"> <li style="float:left;width:50px; height:50px; "> <img src="/static/imghwm/default1.png" data-src="qq.jpg" class="lazy" / alt="Problems with html and css_html/css_WEB-ITnose" > </li> <li style="max-width:90%"> <img src="/static/imghwm/default1.png" data-src="vs.jpg" class="lazy" / alt="Problems with html and css_html/css_WEB-ITnose" > </li> <li style="max-width:90%"> <img src="/static/imghwm/default1.png" data-src="eclipse.jpg" class="lazy" / alt="Problems with html and css_html/css_WEB-ITnose" > </li> </ul></div>
效果图如下
第二段代码
<div> <ul style="max-width:90%"> <li style="float:left; "> <img src="/static/imghwm/default1.png" data-src="qq.jpg" class="lazy" / alt="Problems with html and css_html/css_WEB-ITnose" > </li> <li > <img src="/static/imghwm/default1.png" data-src="vs.jpg" class="lazy" / alt="Problems with html and css_html/css_WEB-ITnose" > </li> <li> <img src="/static/imghwm/default1.png" data-src="eclipse.jpg" class="lazy" / alt="Problems with html and css_html/css_WEB-ITnose" > </li> </ul></div>
效果图如下
第三段代码
<div> <ul style="max-width:90%"> <li style="float:left;width:50px; height:50px; background-color:#009966; "> 1 </li> <li style="width:50px; height:50px; background-color:#339933; "> 2 </li> <li style="width:50px; height:50px; background-color:#666666; "> 3 </li> </ul></div>
效果图如下
第四段代码
-
1
-
2
-
3
效果图如下：
---------------------------------------------------------------------------------
提问：1.为什么不加宽度下一层的元素会和float：left的元素在一行。
2.在第三个图的2和3数字会重叠在一起，为什么不像1图中直接覆盖。
大家可以具体解释每个图中的现象，第四个图中的数字2会被挤到数字1的右边。
回复讨论(解决方案)
同样问题，求分析
同样问题，求分析
没人回答。。。
前台修饰弄的比较少，css是个神奇的东西，有定位真心感觉难！
我是这样理解的：
第一张图：ul，li都是块级元素，会独占一行，设置宽度以后，ul的宽度也是50px，float浮动属性虽然会影响下一个块级元素，但是因为两个li的宽度小于ul的宽度，所以显不出来；
第二张图：宽度自适应，所以即不存在一图的问题；
第三张图：这也是一个宽度不够的问题，这边之所以2和3重叠，其实是看浏览器的，估计你用的是firefox，浏览器之间显示是有差异的，在2的样式表里添加clear：left；就不会出现重叠问题了；
第四张图：2不能说是被1挤到右边的，因为用了浮动属性，所以改变了2的块级元素，所以2合1显示在同一行，因为你的1设置了宽度，2当然从宽度后开始显示，怎么能叫挤呐。
同学求给分。
多做几个案例，总结一下。
这个问题都不是什么问题，很简单的。
出现这种问题，基本都是浮动，宽度的问题。
继续加油。
我是这样理解的：
第一张图：ul，li都是块级元素，会独占一行，设置宽度以后，ul的宽度也是50px，float浮动属性虽然会影响下一个块级元素，但是因为两个li的宽度小于ul的宽度，所以显不出来；
第二张图：宽度自适应，所以即不存在一图的问题；
第三张图：这也是一个宽度不够的问题，这边之所以2和3重叠，其实是看浏览器的，估……
哥们说的挺好的，分会给的，浏览器ie,chrome,firefox其实都是一样的
多做几个案例，总结一下。
这个问题都不是什么问题，很简单的。
出现这种问题，基本都是浮动，宽度的问题。
继续加油。
3q
下面是一个简易选项卡的例子，涉及到你那种方式布局，可以参考一下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><!-- saved from url=(0038)http://js.fgm.cc/learn/lesson2/07.html --><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>简易选项卡</title><style>body,ul,li{margin:0;padding:0;}body{font:12px/1.5 Tahoma;}#outer{width:450px;margin:10px auto;}#tab{overflow:hidden;zoom:1;background:#000;border:1px solid #000;}#tab li{float:left;color:#fff;height:30px;cursor:pointer;line-height:30px;list-style-type:none;padding:0 20px;}#tab li.current{color:#000;background:#ccc;}#content{border:1px solid #000;border-top-width:0;}#content ul{line-height:25px;display:none;margin:0 30px;padding:10px 0;}</style><script>window.onload = function (){ var oLi = document.getElementById("tab").getElementsByTagName("li"); var oUl = document.getElementById("content").getElementsByTagName("ul"); for(var i = 0; i < oLi.length; i++) { oLi[i].index = i; oLi[i].onmouseover = function () { for(var n = 0; n < oLi.length; n++) oLi[n].className=""; this.className = "current"; for(var n = 0; n < oUl.length; n++) oUl[n].style.display = "none"; oUl[this.index].style.display = "block" } }}</script></head><body><div id="outer"> <ul id="tab"> <li class="">第一课</li> <li class="">第二课</li> <li class="current">第三课</li> </ul> <div id="content"> <ul style="display: none; "> <li>网页特效原理分析</li> <li>响应用户操作</li> <li>提示框效果</li> <li>事件驱动</li> <li>元素属性操作</li> <li>动手编写第一个JS特效</li> <li>引入函数</li> <li>网页换肤效果</li> <li>展开/收缩播放列表效果</li> </ul> <ul style="display: none; "> <li>改变网页背景颜色</li> <li>函数传参</li> <li>高重用性函数的编写</li> <li>126邮箱全选效果</li> <li>循环及遍历操作</li> <li>调试器的简单使用</li> <li>典型循环的构成</li> <li>for循环配合if判断</li> <li>className的使用</li> <li>innerHTML的使用</li> <li>戛纳印象效果</li> <li>数组</li> <li>字符串连接</li> </ul> <ul style="display: block; "> <li>JavaScript组成：ECMAScript、DOM、BOM，JavaScript兼容性来源</li> <li>JavaScript出现的位置、优缺点</li> <li>变量、类型、typeof、数据类型转换、变量作用域</li> <li>闭包：什么是闭包、简单应用、闭包缺点</li> <li>运算符：算术、赋值、关系、逻辑、其他运算符</li> <li>程序流程控制：判断、循环、跳出</li> <li>命名规范：命名规范及必要性、匈牙利命名法</li> <li>函数详解：函数构成、调用、事件、传参数、可变参、返回值</li> <li>定时器的使用：setInterval、setTimeout</li> <li>定时器应用：站长站导航效果</li> <li>定时器应用：自动播放的选项卡</li> <li>定时器应用：数码时钟</li> <li>程序调试方法</li> </ul> </div></div></body></html> 下面是一个简易选项卡的例子，涉及到你那种方式布局，可以参考一下
XML/HTML code?12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747……
非常感谢
我是沙发，本来看到有不少回复感到挺兴奋的，但是认真看了两遍后感觉失望，大家都没有清楚地正视问题，譬如一个块元素的长宽高是否属于这个块？为什么会出现完全的重叠，而且之后为什么内容“2”会偏离出本身在块元素内的位置，独自被逼到一边去？clear： left又是为什么会成功？为什么我的safari和ff都同时显现了楼主的情况，究竟是不是浏览器的问题我表示质疑。
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