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function getReturnAjax{
  $.ajax({
    type:"POST",
    url:"ajax/userexist.aspx",
    data:"username="+vusername.value,
    success:function(msg){
    if(msg=="ok"){   
   showtipex(vusername.id,"<img src='images/ok.gif'/><b><font color='#ffff00'>¸ÃÓû§Ãû¿ÉÒÔʹÓÃ</font></b>",false)
      return true;
    }
    else
    {    
    showtipex(vusername.id,"<img src='images/cancel.gif'/><b><font color='#ffff00'>¸ÃÓû§Òѱ»×¢²á</font></b>",false);
      vusername.className="bigwrong";
      return false;
    }
    }
  });
  }
 µ«ÊÇÎÒÃǵ÷ÓÃÕâ¸ögetReturnAjax()·¢ÏÖʼÖÕÈ¡µÃµÄ¶¼ÊÇfalse,ÄǾÍÊÇ˵return true,return false¸ù±¾Ã»ÓÐÆð×÷Óã¬ÔÚ»ðºüÏÂÓÃfirebugµ÷ÊÔÒ²Ö¤Ã÷£¬´úÂë¸ù±¾²»»áÖ´Ðе½return ²¿·Ö¡£
ÎÒÃÇÊÔÏëÔÚº¯ÊýÀïÏȶ¨ÒåÒ»¸ö±äÁ¿£¬È»ºóÔÚajaxÀ︳ֵ£¬×îºóÔÚº¯ÊýµÄĩβ·µ»ØÕâ¸ö±äÁ¿£¬»á²»»áÓÐЧ¹ûÄØ?ÎÒÃÇ°Ñ´úÂëÐÞ¸ÄÈçÏ£º
´úÂë
function getAjaxReturn()   
{
       var bol=false;
  $.ajax({
    type:"POST",
    url:"ajax/userexist.aspx",
    data:"username="+vusername.value,
    success:function(msg){
    if(msg=="ok"){   
   showtipex(vusername.id,"<img src='images/ok.gif'/><b><font color='#ffff00'>¸ÃÓû§Ãû¿ÉÒÔʹÓÃ</font></b>",false)
      // return true;
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Cross Domain AJAX Enabled WCF Service

Background For the basic of how to create an AJAX enabled WCF service, please refer to MSDN: http://msdn.microsoft.com/en-us/library/bb924552.aspx. For the basic of JSONP, please refer to: http://en.wikipedia.org/wiki/JSON#JSONP. This article introduce how to make AJAX enabled WCF service support cr ......

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