css动画之max-height 示例

HTML

CSS

JavaScript

HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>笔下光年</title>
</head>
<body>

<p>逐步改变 max-height, 从 "none" 到 "100px":<p>

<div id="myDIV">
  <p>This DIV element does not have a pre-defined height.</p>
  <p>An animation will change the max-height, from "none" to "100px".</p>
  <p>The height of this DIV element will not exceed 100 pixels.</p>
</div>

<p>max-height 属性支持动画效果。</p>
<p><b>注意:</b> 目前 max-height 属性在 Chrome 浏览器下不会改变 <em>gradually（灰阶）</em>, 在 Firefox 都无法起作用。</p>
<p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p>

</body>
</html>

CSS

#myDIV {
    width: 500px;
    background-color: lightblue;
    overflow: auto;
    border: 1px solid black;
    -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */
    animation: mymove 5s infinite;
}

/* Chrome, Safari, Opera */
@-webkit-keyframes mymove {
    50% {max-height: 100px;}
}

/* Standard syntax */
@keyframes mymove {
    50% {max-height: 100px;}
}

JavaScript