<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head> 
    <title>Parent Page</title> 
        <script language="javascript" type="text/javascript"> 
            function parenttest() { 
                alert("这是父页面的方法!"); 
            } 
            function btnClick() { 
                document.getElementById("childframe").contentWindow.childtest(); 
            } 
    </script> 
</head> 
<body> 
   <div style="margin:auto;"> 
       <h1>This is the Parent Page.</h1> 
       <input type="button" value="调用子页面的方法"  onclick="btnClick()"/>  
    </div> 
    <div style="margin:auto;"> 
       <iframe style="width:300px; height:300px;" id="childframe" src="ChildPage.html"></iframe> 
    </div> 
</body> 
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head> 
    <title>Child Page</title> 
    <script language="javascript" type="text/javascript"> 
      function childtest() { 
          alert("这是子页面的方法!"); 
      } 
      function btnClick() { 
          window.parent.parenttest(); 
      } 
    </script> 
</head> 
<body> 
   <div style="margin:auto;"> 
       <h1>This is the Child Page.</h1> 
       <input type="button" value="调用父页面的方法" onclick="btnClick()"/>  
    </div> 
</body> 
</html>

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