JS中发送验证码的代码片段

function sendCode(obj){  var $btn = $(obj),      timeId = $btn.data("timeid"),      intDiff = 60; //倒计时时间    if(!timeId){      // 此处需要插入ajax调用接口发送验证码过程      timeId = window.setInterval(function(){           var second=0;         if(intDiff > 0){          second = Math.floor(intDiff);           }        $btn.css('background-color','#A9A7A7');        $btn.css('border-color','#A9A7A7');        $btn.html(second+'秒');        intDiff--;            if(intDiff < 1){          window.clearInterval(timeId);          $btn.data("timeid", null);          $btn.html('发送验证码');           $btn.css('background-color','#fd8c49');        }      }, 1000);       $btn.data("timeid", timeId);    }   }