一种在父窗口中得知 window.open()出的子窗口关闭事件的方法（定时器实现)

parent.htm :<br>

<br>

&lt;html&gt;&lt;body&gt;<br>

&lt;p&gt;&nbsp;&lt;/p&gt;<br>

&lt;form name=fm_info&gt;<br>

&lt;input type=text name=txtvalue&gt;<br>

&lt;/form&gt;<br>

&lt;script language=javascript&gt;<br>

var timer<br>

var winopen<br>

function ifwindowclosed() {<br>

&nbsp;&nbsp;&nbsp;&nbsp;if (winopen.closed == true) {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;document.fm_info.txtvalue.value=&quot;child closed&quot;<br>

&nbsp;&nbsp;&nbsp;&nbsp;window.clearinterval(timer)<br>

&nbsp;&nbsp;&nbsp;&nbsp;}<br>

}<br>

&lt;/script&gt;<br>

&lt;input type=button name=btnopen value=open&gt;<br>

<br>

&lt;script language=javascript for=btnopen event=onclick&gt;<br>

document.fm_info.txtvalue.value=&quot;&quot;<br>

&nbsp;&nbsp;&nbsp;&nbsp;winopen=window.open(&quot;child.htm&quot;,&quot;&quot;,&quot;toolbar=no, location=no, directories=no, status=no, menubar=no&quot; )<br>

&nbsp;&nbsp;&nbsp;&nbsp;timer=window.setinterval(&quot;ifwindowclosed()&quot;,500);<br>

&lt;/script&gt;<br>

&lt;/body&gt;&lt;/html&gt;<br>

——————<br>

there can be anything in child.htm<br>