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ajaxObj=createAjaxObject();
var url="/MyTodoes/FetchText?id="+id; 
ajaxObj.open("Get",url,true);
ajaxObj.onreadyStateChange=changeTabCallBack;
ajaxObj.send(null);
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function changeTabCallBack(){
  if(ajaxObj.readyState==4){
     // ÏÂÒ»²½ÑéÖ¤
  }
}
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function changeTabCallBack(){
  if(ajaxObj.readyState==4){
    if(ajaxObj.status==200){
       // ·þÎñ¶Ë·µ»ØÁËÕýÈ·Êý¾Ý£¬¿ªÊ¼ÏìÓ¦´¦Àí
    }
  }
}
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