【JS】一个安全稳定的Javascript的Ajax对象生成函数

做个记号，兼容IE6~9、火狐、Chrome等主流浏览器

  
    

   
     function
   
      getAjax() {
 
   
     if
   
     (window.XMLHttpRequest){
 
   
     return
   
      
   
     new
   
      XMLHttpRequest();
 }
   
     else
   
      
   
     if
   
     (window.ActiveXObject){
 
   
     var
   
      xmldes
   
     =
   
     [
   
     "
   
     MSXML2.XmlHttp
   
     "
   
     ,
   
     "
   
     Microsoft.XmlHttp
   
     "
   
     ,
   
     "
   
     MSXML2.XmlHttp.5.0
   
     "
   
     ,
   
     "
   
     MSXML2.XmlHttp.4.0
   
     "
   
     ,
   
     "
   
     MSXML2.XmlHttp.3.0
   
     "
   
     ];
 
   
     var
   
      xmlobj
   
     =
   
     false
   
     ;
 
 
   
     for
   
     (
   
     var
   
      i
   
     =
   
     0
   
     ;i
   
     <
   
     xmldes.length;i
   
     ++
   
     ){
 
   
     try
   
     {
 xmlobj
   
     =
   
     new
   
      ActiveXObject(xmldes[i]);
 
   
     if
   
     (xmlobj) 
   
     return
   
      xmlobj;
 }
 
   
     catch
   
     (e){}
 }
 
 }
 
   
     return
   
      
   
     false
   
     ;
}