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<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
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<button>回退</button>
<script>
// setTimeout(function () {
// location.href = "http://www.sina.com.cn";
// },5000);
var btn = document.getElementsByTagName("button")[0];
btn.onclick = function () {
//回退
// history.go(-1);
history.back();
}
</script>
</body>
</html>
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