javascript - 无法获取属性值 'nodeValue' : object is null or undefined in IE

Question

<script>
  if (window.XMLHttpRequest)
   {// code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp=new XMLHttpRequest();
   }
  else
   {// code for IE6, IE5
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
  xmlhttp.open("GET","Default.xml",false);
  xmlhttp.send();
  xmlDoc=xmlhttp.responseXML; 

 var management=xmlDoc.getElementsByTagName("Management");

document.write("<tr><td>");
document.write(management[i].getElementsByTagName("RepresentativeName")[0].childNodes[0].nodeValue);
document.write("</td></tr>");

</script>

我正在其他浏览器中使用它，但 xml 元素中没有任何值。但 ie 向我抛出错误并且不渲染 UI

Answer 1

在将其写入文档之前，您需要添加 if 条件。

尝试这样的代码

<script>
  if (window.XMLHttpRequest)
   {// code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp=new XMLHttpRequest();
   }
  else
   {// code for IE6, IE5
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
  xmlhttp.open("GET","Default.xml",false);
  xmlhttp.send();
  xmlDoc=xmlhttp.responseXML; 

 var management=xmlDoc.getElementsByTagName("Management");

document.write("<tr><td>");
if(management[i].getElementsByTagName("RepresentativeName")[0].childNodes[0]){
  document.write(management[i].getElementsByTagName("RepresentativeName")[0].childNodes[0].nodeValue);
}else{
  document.write('');
}
document.write("</td></tr>");

</script>