chrome浏览器51之前的版本，允许页面离开的时候让开发者弹出自定义的提示信息，51版本（包括51）不允许弹出自定义的窗口。
window.onbeforeunload = function(e) {
e.returnValue = "A search is in progress, do you really want to stop the search and close the tab?";
return "A search is in progress, do you really want to stop the search and close the tab?";
}//无效
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