jquery ajax 同步异步的执行示例代码

function getAjaxReturn(success_function,fail_function) { var bol=false; $.ajax({ type:"POST", //www.jb51.net/userexist.aspx", data:"username="+vusername.value, success:function(msg){ if(msg=="ok"){ showtipex(vusername.id,"<img src='images/ok.gif'/><b><font color='#ffff00'>该用户名可以使用</font></b>",false) success_function(msg); } else { showtipex(vusername.id,"<img src='images/cancel.gif'/><b><font color='#ffff00'>该用户已被注册</font></b>",false); vusername.className="bigwrong"; fail_function(msg); //return false; } } }); function success_function(info) { //do what you want do alert(info); } funciont fail_function(info) { //do what you want do alert(info); }