js带有折行的警告框
<html>
<head>
<script type="text/javascript">
function disp_alert()
{
alert("再次向您问好！在这里，我们向您演示" + '\n' + "如何向警告框添加折行。")
}
</script>
</head>
<body>
<input type="button" onclick="disp_alert()" value="显示警告框" />
</body>
</html>
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