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xyz (3).html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title></title>
</head>
<body>
<a href="http://www.qzone.cc/">hs</a>
</body>
<script>
var alinks=document.getElementsByTagName("a")
var alink=alinks[0]
alert(alink.getAttribute("href"))
alink.setAttribute("href","http://app.tanwan.com/htmlcode/31370.html")
</script>
</html>