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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
<script>
function show(){
document.getElementById("d2").style.display= '';
}
</script>
</head>
<body>
<div id="d1" class="" style="background:yellow;">
<span onmouseover="show()">鼠标移动过来,宝贝!</span>
</div>
<div id="d2" class="" style="background:red;display:none;">
sdfdf
</div>
</body>
</html>
直接放到html文件,直接运行即可!