<!-- 將target配置成一個隱藏的iframe -->
<form id= "form1" enctype ="multipart/form-data" action= "/FileDownload/register.do?type=upload" method ="post" target= "hframe">
     附件： <input type ="file" name="path"/>< br/>
     <input type ="submit" value="確定"/>
     <iframe name ="hframe" id="hframe" style=" display: none" ></iframe >
</form>
 

//後臺的程式碼中呼叫父視窗的js函式，回寫結果
out.write("<script type='text/javascript'>parent.callback('123')</script>" );