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							- <!DOCTYPE html>
 
- <html lang="en">
 
- <head>
 
-   <meta charset="UTF-8">
 
-   <meta http-equiv="X-UA-Compatible" content="IE=edge">
 
-   <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
-   <title>Document</title>
 
-   <style>
 
-     #div1{
 
-       width: 200px;
 
-       height: 200px;
 
-       background: red;
 
-       /* 过度      属性  执行时间  运动的方式   延迟时间 */
 
-       transition: width 2s linear 2s;
 
-       /* transition-property */
 
-       /* 设置对象中参与过度的属性 */
 
-       /* transition-duration */
 
-       /* 设置对象过度的持续时间 */
 
-       /* transition-timing-function*/
 
-       /* 设置对象中过度的类型 */
 
-       /* transition-delay */
 
-       /* 设置对象延迟过度的时间 */
 
-     }
 
-   </style>
 
- </head>
 
- <body>
 
-   <div id="div1"></div>
 
-   <button id="btn1">btn</button>
 
-   <script>
 
-     var btn = document.getElementById('btn1')
 
-     var div1 = document.getElementById('div1')
 
-     btn.onclick = function(){
 
-       div1.style.width = 500 + 'px'
 
-     }
 
-   </script>
 
- </body>
 
- </html>
 
 
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