復制代碼 代碼如下:
<!doctype html>
<html lang="cn">
<head>
<meta charset="UTF-8">
<meta content="">
<meta content="">
<title>js離開當前頁面前判斷條件提示是否要離開頁面</title>
<script type="text/javascript">
window.onbeforeunload = function()
{
var unloads = document.getElementById("unloads").value;
if(unloads == null || unloads == ""){
return "您確定要退出頁面嗎？";
}
}
</script>
</head>
<body>
<input type="text" value="" />
</body>
</html>
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