js代码不执行怎么回事，感没有问题啊
<!DOCTYPE html>
<html>
<head>
<title>scroll</title>
<link type="text/css" rel="stylesheet" href="css/scroll.css" >
<script type="text/javascript" src="js/scroll.js"></script>
</head>
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<!DOCTYPE html>
<html>
<head>
<title>scroll</title>
<link type="text/css" rel="stylesheet" href="css/scroll.css" >
<script type="text/javascript" src="js/scroll.js"></script>
</head>
2016-08-21
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