<head>
<title>无标题页</title>
<script type="text/javascript">
var a = document.getElementById("a");
alert(a.className);
</script>
</head>
<body>
<div id="a"></div>
</body>
<title>无标题页</title>
<script type="text/javascript">
var a = document.getElementById("a");
alert(a.className);
</script>
</head>
<body>
<div id="a"></div>
</body>
解决方案 »
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