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明：假設有2個頁面，index.html和inner.html。其中index.html中有一個iframe，這個iframe的src指向inner.html。
我們現在要做的就是：
1.在index.html中調用inner.html上的一個js方法
2.在inner.html中調用index.html上的一個js方法
實現代碼如下：
index.html
1.<html>
2.<head>
3.<script type="text/javascript">
4.function ff(){
5.alert(">>this is index's js function");
6.}
7.</script>
8.</head>
9.<body>
10.<div style="background: lightblue;">
11.This is index page.
12.<input type="button" value="run index's function" onclick="ff();" />
13.<input type="button" value="run inner page's function" onclick='window.frames["childPage"].ff();' />
14.</div>
15.<iframe id="childPage" name="childPage" src="inner.html" width="100%" frameborder="0"></iframe>
16.</body>
17.</html>
inner.html
1.<html>
2.<head>
3.<script type="text/javascript">
4.function ff(){
5.alert(">>this is inner page's js function");
6.}
7.</script>
8.</head>
9.<body>
10.<div style="background: lightgreen;">
11.This is inner page.
12.<input type="button" value="run index's function" onclick='parent.window.ff();' />
13.<input type="button" value="run inner page's function" onclick="ff();" />
14.</div>
15.</body>
16.</html>
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