方式一：(適用與IE瀏覽器，而且刷新不提示，只在點(diǎn)擊瀏覽器關(guān)閉按鈕的時(shí)候提示)
<script type="text/javascript">
window.οnbefοreunlοad=onclose;
function onclose()
{
if(event.clientX>document.body.clientWidth&&event.clientY<0||event.altKey)
{
return "您要離開嗎？";
}
}
</script>
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方式二：適用與IE和FF，不區(qū)分刷新和關(guān)閉
<script type="text/javascript">??
???
??? window.onbeforeunload = onbeforeunload_handler;??
??? window.onunload = onunload_handler;??
??? function onbeforeunload_handler(){??
??????? var warning="確認(rèn)退出?";??????????
??????? return warning;??
??? }??
??????
??? function onunload_handler(){??
??????? var warning="謝謝光臨";??
??????? alert(warning);??
??? }??
?
</script>??
---------------------------------------------------------------------------------------------------
方式三：適用與IE和FF，不區(qū)分刷新和關(guān)閉，最簡(jiǎn)單的
<script type="text/javascript">
window.οnbefοreunlοad=onclose;
function onclose()
{?
return "您確定退出嗎？";

}
</script>
---------------------------------------------------------------------------------------------------
方式四：適用與IE和FF，不區(qū)分刷新和關(guān)閉，稍復(fù)雜的
<script language="javascript">
var MSG_UNLOAD="如果你此時(shí)離開檔案系統(tǒng)，所做操作信息將全部丟失，是否離開?";

var UnloadConfirm = {};

//啟用監(jiān)聽瀏覽器刷新、關(guān)閉的方法
UnloadConfirm.set = function(confirm_msg){
??? window.onbeforeunload = function(event){
??????? event = event || window.event;
??????? event.returnValue = confirm_msg;
??? }
}

//關(guān)閉監(jiān)聽瀏覽器刷新、關(guān)閉的方法

UnloadConfirm.clear = function(){
??? window.onbeforeunload = function(){};
}
UnloadConfirm.set(MSG_UNLOAD);

</script>
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方式五：只適用于IE6下的關(guān)閉按鈕和快捷鍵關(guān)閉的，刷新不提示
<script type="text/javascript">
window.οnbefοreunlοad=onclose;
function onclose()
{?
var warnning = '<fmt:message key="systemMessage.exitWarning" />';
var beforeExit='<fmt:message key="systemMessage.beforeExitWarning" />';
? if(event.clientY<0? &&? event.clientX>document.body.clientWidth-20? ||? event.clientY<0? &&? event.clientX<20? ||
event.altKey || event.ctrlKey ||? event.clientY>document.body.clientHeight){

alert(beforeExit);
return warnning;
}?????
}
</script>
****************************************************************************************************
另附判斷瀏覽器類型的JS
<script type="text/javascript">
??????? var Sys = {};
??????? var ua = navigator.userAgent.toLowerCase();
??????? if (window.ActiveXObject)
??????????? Sys.ie = ua.match(/msie ([\d.]+)/)[1]
??????? else if (document.getBoxObjectFor)
??????????? Sys.firefox = ua.match(/firefox\/([\d.]+)/)[1]
??????? else if (window.MessageEvent && !document.getBoxObjectFor)
??????????? Sys.chrome = ua.match(/chrome\/([\d.]+)/)[1]
??????? else if (window.opera)
??????????? Sys.opera = ua.match(/opera.([\d.]+)/)[1]
??????? else if (window.openDatabase)
??????????? Sys.safari = ua.match(/version\/([\d.]+)/)[1];
???????
??????? //以下進(jìn)行測(cè)試
??????? if(Sys.ie) document.write('IE: '+Sys.ie);
??????? if(Sys.firefox) document.write('Firefox: '+Sys.firefox);
??????? if(Sys.chrome) document.write('Chrome: '+Sys.chrome);
??????? if(Sys.opera) document.write('Opera: '+Sys.opera);
??????? if(Sys.safari) document.write('Safari: '+Sys.safari);

??? </script>
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區(qū)分瀏覽器，IE和FF分別處理（奇怪的是,IE下有時(shí)候失效）
<script type="text/javascript">
window.οnbefοreunlοad=onclose;
function onclose()
{?
var Sys = {};
var warnning = '<fmt:message key="systemMessage.exitWarning" />';
??????? var ua = navigator.userAgent.toLowerCase();
??????? if (window.ActiveXObject)
??????????? Sys.ie = ua.match(/msie ([\d.]+)/)[1]
??????? else if (document.getBoxObjectFor)
??????????? Sys.firefox = ua.match(/firefox\/([\d.]+)/)[1]
??????? if(Sys.ie) {//for IE
if(event.clientX>document.body.clientWidth&&event.clientY<0||event.altKey)???
{??????
window.event.returnValue = warnning ;????
}???
}
??????? if(Sys.firefox) //for FF
??????? return warnning;
}
??? </script>
--------------------------------------------
最簡(jiǎn)單的判斷瀏覽器類型的方法
<script type="text/javascript">
if(-[1,]){
???? alert("這不是IE瀏覽器！");
}else{
???? alert("這是IE瀏覽器！");
}
</script>
[1，]在標(biāo)準(zhǔn)瀏覽器會(huì)返回字符串"1",相當(dāng)于調(diào)用[1,].toString,
,IE則返回"1,"。但是這樣IE與標(biāo)準(zhǔn)都會(huì)通過檢測(cè)，因此使用負(fù)號(hào)強(qiáng)制轉(zhuǎn)換為數(shù)字，
標(biāo)準(zhǔn)能成功轉(zhuǎn)換為1，1會(huì)在if中自動(dòng)轉(zhuǎn)換為true，而IE則轉(zhuǎn)換為NaN,再自動(dòng)轉(zhuǎn)換為false!

轉(zhuǎn)載于:https://www.cnblogs.com/tonykan/archive/2013/01/10/2854736.html

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