javascript在当前窗口关闭前检测窗口是否关闭

在当前窗口关闭前,检测当前窗口是否关闭

<pre name="code" class="html"><pre name="code" class="html"><HTML><HEAD> 
<script Language="JavaScript"> 
window.onbeforeunload=function(event){ 
alert("222"); //这里IE9会执行,CHROME不会执行 
// if(event.clientX>document.body.clientWidth && event.clientY<0||event.altKey){ //如果是刷新,则不提示 
RETURN "确定关闭窗口?"; 
// } 
} 
var aa ; 
var intervalVar; 
function showClose(){ 
console.log(" wait and val is :"+aa.closed); 
clearInterval(intervalVar); 
} 
function loadform(){ 
aa=window.open('foo.html', 'windowName',"width=200,height=200,scrollbars=no"); 
console.log("check close before op and val is :"+aa.closed); //现在窗口未关闭,结果为false 
aa.close();<span style="white-space:pre"> </span> //调用窗口关闭的方法 
console.log("not in wait and val is :"+aa.closed); //此时aa.close正在调用过程中,结果为false 
intervalVar = setInterval(showClose,100); }; //用循环检测子窗口是否关闭,其实用setTimeout也是可以的,不过值要设得大一些 
function unloadform(){ alert("2!"); } 
</script> 
</HEAD><BODY OnLoad="loadform()" OnUnload="unloadform()"> 
</BODY></HTML>

在ie9中,如果刷新文档的话,unloadform和onbeforeunload都会执行,如果是关闭页面的话只会执行onbeforeunload事件

值得注意的是,onunload在关闭页面时不会运行,估计此函数为浏览器内置事件,不能重新定义

在chrome中,如果刷新文档的话,unloadform和onbeforeunload都会执行,关闭页面的话,只会执行onbeforeunload,值得注意的是有注释的那一行一直不会执行.

如果是window.open打开的子窗口的话,可以通过window.closed属性检测是否关闭

<HTML><HEAD> 
<script Language="JavaScript"> 
var aa ; 
var intervalVar; 
function showClose(){ 
console.log(" wait and val is :"+aa.closed); 
clearInterval(intervalVar); 
} 
function loadform(){ 
aa=window.open('foo.html', 'windowName',"width=200,height=200,scrollbars=no"); 
console.log("check close before op and val is :"+aa.closed); //现在窗口未关闭,结果为false 
aa.close(); //调用窗口关闭的方法 
console.log("not in wait and val is :"+aa.closed); //此时aa.close正在调用过程中,结果为false 
intervalVar = setInterval(showClose,100); }; //用循环检测子窗口是否关闭,其实用setTimeout也是可以的,不过值要设得大一些 
function unloadform(){ alert("2!"); } 
</script> 
</HEAD><BODY OnLoad="loadform()" OnUnload="unloadform()"> <a href="test.htm">调用</a> 
</BODY></HTML>

父窗口关闭时会自动将window.open关闭的代码

<HTML><HEAD> 
<script Language="JavaScript"> 
var aa ; 
var intervalVar; 
window.onbeforeunload=function(event){ 
aa.close(); 
return "hello"; 
} 
function loadform(){ 
aa=window.open('test.htm', 'windowName',"width=200,height=200,scrollbars=no"); 
}; 
function unloadform(){ alert("2!"); } 
</script> 
</HEAD><BODY OnLoad="loadform()" OnUnload="unloadform()"> <a href="test.htm">调用</a> 
</BODY></HTML>