第1个回答 2017-09-17
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<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script>
window.onbeforeunload = function(e){
e.returnValue = '确定离前页面?';
}
</script>
</head>
<body>
我试
</body>
</html>本回答被提问者和网友采纳
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