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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;
    }
    }
  });
  }
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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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