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jquery+ajax实现无刷新提交的功能

   <script type="text/javascript" src="jquery-1.3.2.min.js" mce_src="js/jquery.js"></script>  
   <input name="writer" id="writer" type="text" value="" />  
   <input name="pass" id="pass" type="password" value="" />  
   <input type="submit" name="button" id="button" value="提交" /> 
    <!--这里不需要form,因为提交时call一个函数   -->
    <script type="text/javascript"> 
     
    $(document).ready(function(){         //DOM的onload事件处理函数  
       $("#button").click(function(){           //当按钮button被点击时的处理函数  
         postdata();                                       //button被点击时执行postdata函数  
     });  
   });  
  
   function postdata(){                              //提交数据函数  
      $.ajax({                                                  //调用jquery的ajax方法  
        type: "POST",    


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xml数据:
writer.write("<root>" +
   "<name>a</name>" +
   "<name>b</name>"+
   "</root>");
前台解析:
request.onreadystatechange=function(){
  if(request.readyState==4){
   var x=requ ......
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