js离开或刷新页面检测(且兼容FF,IE,Chrome)_javascript技巧

复制代码 代码如下:

<script><BR> function closeIt()<BR> {<BR> return "Any string value here forces a dialog box to \n" + <BR> "appear before closing the window.";<BR> }<BR> window.onbeforeunload = closeIt;<BR></script>


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兼容FF,IE,Chrome的js离开或刷新页面检测,关键的部分是要有return