接着之前的[css]我要用css画幅画(四)， 这次我给小明和静静增加了对话，用了简单的动画效果。
github：https://github.com/bee0060/Css-Paint ， 完整代码在pages/sun-house-4.html和相关的css中可以找到
demo： http://bee0060.github.io/Css-Paint/pages/sun-house/sun-house-5.html
完整html如下：
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Css Paint</title> 6 <link rel="stylesheet" type="text/css" href="../css/sun.css" /> 7 <link rel="stylesheet" type="text/css" href="../css/house.css" /> 8 <link rel="stylesheet" type="text/css" href="../css/human.css" /> 9 <link rel="stylesheet" type="text/css" href="../css/cloud.css" />10 11 <link rel="stylesheet" type="text/css" href="../css/human-animate.css" />12 </head>13 <body>14 <div class="sun">15 <div class="sun-body"></div>16 <div class="sun-shine-light sun-shine-light1"></div>17 <div class="sun-shine-light sun-shine-light2"></div>18 <div class="sun-shine-light sun-shine-light3"></div>19 <div class="sun-shine-light sun-shine-light4"></div>20 <div class="sun-shine-light sun-shine-light5"></div>21 </div>22 23 <div class="house-width house">24 <div class="house-width house-roof house-roof-left"></div>25 <div class="house-width house-roof house-roof-right"></div>26 <div class="house-width house-wall"> 27 <div class="house-wall-door"> 28 <div class="house-wall-door-handle"></div>29 </div>30 </div>31 </div>32 33 <div class="human human-pos-1">34 <p class="lines human-speak">大家好，我叫小明。</p>35 <p class="lines human-speak human-speak-delay-3">我是一个程序员，最喜欢宅在家里LOL。</p>36 <p class="lines human-speak human-speak-delay-12">静静，我们交个朋友好吗？我的电话是13800123456。</p>37 <div class="human-head-normal"></div>38 <div class="human-body-normal"></div>39 <div class="human-arms-normal"></div>40 <div class="human-legs-normal"></div>41 </div>42 43 <div class="human human-pos-2">44 <p class="lines human-speak human-speak-delay-6">大家好，我叫静静</p>45 <p class="lines human-speak human-speak-delay-9">和大家看到的一样，我热爱舞蹈。</p>46 <p class="lines human-speak human-speak-delay-15">不要，程序员什么的最讨厌了！</p>47 <div class="human-head-normal"></div>48 <div class="human-body-normal"></div>49 <div class="human-arms-normal"></div>50 <div class="human-legs-1"></div>51 </div>52 53 <div class="cloud cloud-pos cloud-pos-1">54 <div class="cloud-pos cloud-border cloud-bg cloud-top"></div>55 <div class="cloud-pos cloud-border cloud-bg cloud-left"></div>56 <div class="cloud-pos cloud-border cloud-bg cloud-right"></div>57 <div class="cloud-pos cloud-border cloud-bg cloud-bottom"></div>58 </div>59 <div class="cloud cloud-pos cloud-pos-2">60 <div class="cloud-pos cloud-border cloud-bg cloud-top"></div>61 <div class="cloud-pos cloud-border cloud-bg cloud-left"></div>62 <div class="cloud-pos cloud-border cloud-bg cloud-right"></div>63 <div class="cloud-pos cloud-border cloud-bg cloud-bottom"></div>64 </div>65 </body>66 </html>
我将所需的动画css放在独立的文件中：
1 .human-speak { 2 color: #fff; 3 float: left; 4 -webkit-animation-duration: 3s; 5 -webkit-animation-name: humanLineAppear; 6 } 7 8 .human-speak-delay-3 { 9 -webkit-animation-delay: 3s10 }11 12 .human-speak-delay-6 {13 -webkit-animation-delay: 6s14 }15 16 .human-speak-delay-9 {17 -webkit-animation-delay: 9s18 }19 20 .human-speak-delay-12 {21 -webkit-animation-delay: 12s22 }23 24 .human-speak-delay-15 {25 -webkit-animation-delay: 15s26 }27 28 @-webkit-keyframes humanLineAppear{29 from{30 top: -50px;31 color: #fff;32 }33 20%{34 top: -40px;35 color: #000;36 z-index:10;37 }38 80%{39 top: -40px;40 color: #000;41 z-index:10;42 }43 to{44 top: -50px;45 color: #fff;46 z-index:1;47 }48 }
这里用到的陌生的css属性或关键字包括：
1. -webkit-animation-duration
2.-webkit-animation-delay
3. -webkit-animation-name
4.@-webkit-keyframes
照例先上MDN文档地址： https://developer.mozilla.org/zh-CN/docs/Web/CSS/CSS_Animations/Using_CSS_animations
动画系（animation属性及其子属性）的css在chrome中都需要加上浏览器前缀（-webkit-)， 本以为前卫的chrome中不需要加前缀了，小小的遗憾了一把。下面的说明都把前缀省略。
以上1-3都是css属性，可以添加在css选择器中，或以内联属性的方式直接添加在标签的style属性中。
而第4个keyframes不同，下面再说。
1.animation-duration： 指定整个动画执行所需的时间， 接受time格式的值，即必须是数字+单位的格式， 单位可以是s（秒）或ms(毫秒），默认值为0s。
2.animation-delay： 指动画延迟执行的时间，即对象加载完毕到开始执行动画之间的时间，接受的时间格式也是时间，默认值为0s。
3.animation-name： 用于指定使用的动画规则名称。 默认值为none。
4.@keyframes：这是一个关键字， 中文翻译是“关键帧”。 开头的“@”符号是必须的，加上浏览器前缀时应该写成： @-webkit-keyframes yourKeyframesName， 其中yourKeyframesName是你的关键帧名称。
该关键字用于声明动画规则，也可以看作一个特殊的选择器。 有点类似js中用于声明函数的function关键字。 语法类似如下：（示例中增加了-wekit-前缀）
1 @-webkit-keyframes humanLineAppear{ 2 from{ 3 top: -50px; 4 color: #fff; 5 } 6 20%{ 7 top: -40px; 8 color: #000; 9 z-index:10;10 }11 80%{12 top: -40px;13 color: #000;14 z-index:10;15 }16 to{17 top: -50px;18 color: #fff;19 z-index:1;20 }21 } 关键帧的语法如上，关键帧内部以类似选择器的方式书写css属性，但是“选择器” 名字不再是id、className， 而是帧的描述， 或叫时间节点的描述，接受from,to或百分比数值。
其中from等同于0%， to等同于100%，
0%表示动画开始时刻， 100%表示结束时刻。 如果动画执行时间（animation-duration属性的值）是10s,那么50%表示第5秒这个时刻。
里面的每个百分比数值，都代表动画执行过程中的一个时间节点，我们暂称为： “帧”， 而帧的CSS属性集合，暂称为“帧选择器”。
帧选择器用于设置动画运行中某时间节点的css样式。
不同帧之间如果设置了相同的css属性名和不同的属性值，
浏览器会按照帧的时间顺序，针对这个CSS属性，找到属性值不同的最相邻的帧的组合（可能有多个帧的组合），以示例中的代码为例， 对于top属性会找到如下组合：
1. from(0%) --> 20% : top从-50px 变为-40px
2. 80% --> to(100%) : top从-40px 变为-50px
上面的帧组合都有开始和结束帧，且其中都包含至少一个CSS属性的改变，我们暂时称其为： “帧区间”。
浏览器在动画执行时， CSS属性会在帧区间内匀速的变化，即从开始帧指定的属性值匀速增加或减少至结束帧指定的属性值。
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要让一个动画生效， 以下3个条件必须满足：
1. animation-name需要指向一个有效的用@keyframes声明的关键帧 ， 表示动画有一个有效的动画规则。
2. animation-duration大于0s， 表示动画会有大于0秒的执行时间。
3. animation-iteration-count大于0， 表示动画至少会执行1次。（该属性默认值是1，所以一般不用设置就可以）
好了，现在你应该也可以写一个属于自己的简单动画了。
今天就到这里， 谢谢观看。 如有错误，欢迎指正。
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