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     2.1 ´´½¨XMLHttpRequest¶ÔÏó  createXHR()
     2.2 ×¼±¸Òª·¢Ë͵½·þÎñÆ÷µÄ²ÎÊý .
     2.3 Ö¸¶¨ÓÃÓÚ´¦ÀíÓ¦´ðµÄº¯Êý . xhr.onreadystatechange = fn [ »Øµ÷º¯Êý ] ;
     2.4 open() , send() ;
    
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        ͨÐŹý³Ì½áÊø  £º xhr.readyState == 4
        ·þÎñÆ÷Ö´ÐР   £º xhr.status == 200  
      3.2 ¶Ô·þÎñÆ÷µÄÓ¦´ð½á¹û½øÐд¦Àí :
          ¸´ÔÓµÄÓÃxhr.responseXML (DOM·½Ê½)
   ¼òµ¥µÄÓÃxhr.responseText(·µ»ØµÄ×Ö·û´®)
          
       
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      url = "/ajax/test.jsp" ;
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