<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script type="text/javascript">
var getGuid = function () {
var guid = "";
for (var i = 1; i <= 32; i++) {
var n = Math.floor(Math.random() * 16.0).toString(16);
guid += n;
if ((i == 8) || (i == 12) || (i == 16) || (i == 20))
guid += "-";
}
return guid;
}
</script>
</head>
<body>
<input type="button" value="测试" onclick="alert(getGuid());"/>
</body>
</html>
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原文：http://www.cnblogs.com/bubugao/p/4558586.html