一个ajax+xml的问题,您可能一看就知道错误在哪!!!


index.jsp  如下:
<%@page contentType="text/html;charset=gb2312" language="java" errorPage=""   %>   
  <html>   
  <head>   
  <meta   http-equiv="Content-Type"   content="text/html; charset=gb2312">   
  <script   language="javascript">   
  var   http_request   =   false;   
  function   send_request(url)   {//初始化、指定处理函数、发送请求的函数   
                                    
  http_request   =   false;   
  //开始初始化XMLHttpRequest对象   
  if(window.XMLHttpRequest)   {   //Mozilla   浏览器   
  http_request   =   new   XMLHttpRequest();   
  if   (http_request.overrideMimeType)   {//设置MiME类别   
  http_request.overrideMimeType('text/xml');   
  }   
  }   
  else   if   (window.ActiveXObject)   {   //   IE浏览器   
  try   {   
  http_request   =   new   ActiveXObject("Msxml2.XMLHTTP");   
  }   catch   (e)   {   
  try   {   
  http_request   =   new   ActiveXObject("Microsoft.XMLHTTP");   
  }   catch   (e)   {}   
  }   
  }   
  if   (!http_request)   {   //   异常，创建对象实例失败   
  window.alert("不能创建XMLHttpRequest对象实例.");   
  return   false;   
  }   
  http_request.onreadystatechange   =   processRequest;   
  //   确定发送请求的方式和URL以及是否同步执行下段代码   
  http_request.open("GET",   url,   false);   
  http_request.send();   
  setTimeout("send_request('"+url+"')",2000);   
  }   
  //   处理返回信息的函数   
          function   processRequest()   {   
                  if   (http_request.readyState   ==   4)   {   //   判断对象状态   
                          if   (http_request.status   ==   200)   {   //   信息已经成功返回，开始处理信息   
                                  var   xmlobj   =   http_request.responseXML;   
                                  var   elmDoc   =   xmlobj.getElementsByTagName("singleCur");  
                                  alert(elmDoc.length);
                                    if(document.body.firstChild!=null){   
                                          document.body.removeChild(document.body.firstChild);   
                                              //alert("del");//test   
                                    }   
                                    var   table=document.createElement("table");   
                                    table.setAttribute("border","1");   
                                    table.setAttribute("width","100%");   
                                    table.setAttribute("cellspacing",0);   
                                    table.setAttribute("cellpadding",0);   
                                    var   head=table.createTHead();   
                                    var   headrow=head.insertRow(0);   
                                    headrow.insertCell(0).appendChild(document.createTextNode("货币"));   
                                    headrow.insertCell(1).appendChild(document.createTextNode("买价"));   
                                    headrow.insertCell(2).appendChild(document.createTextNode("卖价"));   
    
                                  for(var   i=0;i<elmDoc.length;i++)   {   //   循环读取     
                                                var   singleCur   =   elmDoc[i];   
                                                  row=table.insertRow(i+1);   
                                                  row.insertCell(0).appendChild(document.createTextNode(   
                                                                                      singleCur.getElementsByTagName("curid")[0].firstChild.data));   
                                                  row.insertCell(1).appendChild(document.createTextNode(   
                                                                                      singleCur.getElementsByTagName("buy")[0].firstChild.data));   
                                                  row.insertCell(2).appendChild(document.createTextNode(   
                                                                                      singleCur.getElementsByTagName("sell")[0].firstChild.data));   
  }   
                                  document.body.appendChild(table);   
                          }   else   {   //页面不正常   
                                  alert("您所请求的页面有异常。"   +   http_request.status);   
                          }   
                  }   
          }   
  </script>   
  </head>   
    
  <body   onload="send_request('nowData.xml')">   
  </body>   
  </html>

解决方案 »

  1.   

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  2.   

    alert(doc.getElementsByTagName("id")[0].text)
    先看这个有没有值