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<html>
<head>
<style>
body{
background-image:url('smiley.gif');
background-repeat:no-repeat;
background-attachment:fixed;/*图片不会移动*/
}
</style>
</head>
<body>
<p>The background-image is fixed. Try to scroll down the page.</p>
</body>
</html>
输入 JavaScript 代码……
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输入 CSS 代码……