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@@ -0,0 +1,31 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ .box{
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+ width: 300px;
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+ height: 50px;
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+ background-color: red;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="box"></div>
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+ <script>
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+ var oBox = document.getElementsByClassName("box")[0];
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+
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+ // setTimeout(function(){
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+ // oBox.style.width = "400px"
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+ // },2000)
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+
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+ // offsetWidth 获取元素的宽度
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+ // offsetHeight 获取元素高度
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+ setInterval(function(){
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+ oBox.style.width = oBox.offsetWidth + 10 +"px";
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+ },16)
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+ </script>
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+</body>
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+</html>
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