眾所周知 window.open() 函數(shù)可以用來打開一個(gè)新窗口，那么如何在子窗體中向父窗體傳值呢，其實(shí)通過 window.opener 即可獲取父窗體的引用。
如我們新建窗體 FatherPage.htm:
XML-Code:
<script type="text/javascript">
function OpenChildWindow(){
window.open('ChildPage.htm'); }
</script>
<input type="text" id="txtInput" />
<input type="button" value="OpenChild" onclick="OpenChildWindow()" />然后在 ChildPage.htm 中即可通過 window.opener 來訪問父窗體中的元素：
XML-Code:
<script type="text/javascript">
function SetValue(){
window.opener.document.getElementById('txtInput').value =document.getElementById('txtInput').value;
window.close();}
</script>
<input type="text" id="txtInput" />
<input type="button" value="SetFather" onclick="SetValue()" />其實(shí)在打開子窗體的同時(shí)，我們也可以對(duì)子窗體的元素進(jìn)行賦值，因?yàn)?window.open 函數(shù)同樣會(huì)返回一個(gè)子窗體的引用，因此 FatherPage.htm 可以修改為：
XML-Code:
<script type="text/javascript">
function OpenChildWindow(){
var child = window.open('ChildPage.htm');
child.document.getElementById('txtInput').value =document.getElementById('txtInput').value; }
</script>
<input type="text" id="txtInput"/>
<input type="button" value="OpenChild" onclick="OpenChildWindow()" />通過判斷子窗體的引用是否為空，我們還可以控制使其只能打開一個(gè)子窗體：
XML-Code:
<script type="text/javascript">
var childfunction OpenChildWindow(){
if(!child) child = window.open('ChildPage.htm');
child.document.getElementById('txtInput').value =document.getElementById('txtInput').value; }
</script>
<input type="text" id="txtInput" />
<input type="button" value="OpenChild" onclick="OpenChildWindow()" />光這樣還不夠，當(dāng)關(guān)閉子窗體時(shí)還必須對(duì)父窗體的child變量進(jìn)行清空，否則打開子窗體后再關(guān)閉就無法再重新打開了：
XML-Code:
<body onunload="Unload()">
<script type="text/javascript">
function SetValue(){
window.opener.document.getElementById('txtInput').value =document.getElementById('txtInput').value;
window.close();}
function Unload(){
window.opener.child=null;}
</script>
<input type="text" id="txtInput" />
<input type="button" value="SetFather" onclick="SetValue()" />
</body>
