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);
    }  
 }