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url: stringÀàÐÍ ÇëÇóHTMLÒ³ÃæµÄURLµØÖ·
data(¿ÉÑ¡): object ·¢ËÍÖÁ·þÎñÆ÷µÄkey/valueÊý¾Ý
callback(¿ÉÑ¡):function ÇëÇóÍê³Éʱ»Øµ÷º¯Êý
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<style type="text/css">
* { margin:0; padding:0;}
body { font-size:12px;}
.comment { margin-top:10px; padding:10px; border:1px solid #ccc;background:#DDD;}
.comment h6 { font-weight:700; font-size:14px;}
.para { margin-top:5px; text-indent:2em;background:#DDD;}
</style>
  $(function(){
      $("#send").click(function(){
              $("#resText").load("test.html .para",function (responseText, textStatus, //test.html .paraΪtest.htmlÖÐ.classΪparaµÄÄÚÈÝXMLHttpRequest){
                         alert( $(this).html() );    //ÔÚÕâÀïthisÖ¸ÏòµÄÊǵ±Ç°µÄDOM¶ÔÏ󣬼´ $("#iptText")[0]
                         alert(responseText);       //ÇëÇ󷵻صÄÄÚÈÝ
                         alert(textStatus);            //ÇëÇó״̬£ºsuccess£¬error
                         alert(XMLHttpRequest);     //XMLHttpRequest¶ÔÏó
            });
      })
  })
<input type="button" id="send" value="Ajax»ñÈ¡" />
<div  class="comment">
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</div>
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