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   Ò»ÖÖ¿Í»§¶Ë¼¼Êõ ,Ϊ»¥ÁªÍøÓû§Ìṩ¸ü¼ÓÓÑÉÆµÄ½»»¥½çÃæ,¸ü¼ÓÁ÷³©µÄÓû§ÌåÑé.Ò²¾ÍÊÇËùνµÄÅÖ¿Í»§¶Ë,Ê¹ÍøÒ³µÄЧ¹ûÄܹ»Ïñ°²×°ÔÚ¼ÆËã»úÉϵÄÓ¦ÓÃÈí¼þ»òϵͳһÑùÓѺûªÀö.
ËüÓÉÈçÏÂËÄÖÖ¼¼Êõ×é³É:CSS + DOM + XMLHttpRequest+ JavaScript .
       ¸÷²¿·Ö¹¦ÄÜÈçÏÂ:
       CSS : ¿ØÖÆÒ³ÃæµÄÏÔʾ ¡£
       DOM : ¿ØÖÆÎĵµ½á¹¹ ¡£
       XMLHttpRequest: ¸ºÔðÓë·þÎñÆ÷½øÐÐÒ첽ͨÐÅ ¡£
       JAVAScript : µ÷Ó㬿ØÖÆÆäËûÈý¸ö×é³É²¿·Ö¡£
Èç¹ûÈ¥µôXMLHttpRequestÔòΪDHTML¼¼Êõ.
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»ù±¾Á÷³ÌÈçÏÂ:
   1) ʼþ´¥·¢Í¨ÐŹý³Ì
   2)
     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() ;
    
   3) ±àд»Øµ÷º¯Êý .
      3.1
        ͨ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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XMLHttpRequestÓë·þÎñÆ÷Ö®¼äÊý¾Ý½»»»µÄ·½Ê½ÓÐgetºÍpostÁ½ÖÖ.
ʹÓÃPOST·½Ê½Ìá½»:
      url = "/ajax/test.jsp" ;
      XMLHttpRequest.open( "POST" , url );
     


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