text:    var bnt =document.getElementById('bnt');
      
      $('#bnt').click(function (){
      var t=60;
      bnt.disabled = true;
      bnt.style.backgroundColor = '#B9C3C9';
      var times =  setInterval(function(){	
      	bnt.innerHTML = t+'s'; 
      	t--;
     	    if(t == 0){
     	    	
     	    	
     	    bnt.innerHTML = '获取验证码';
     	    bnt.disabled = false;
     	    bnt.style.backgroundColor = '#38383A';
     	    clearInterval(times);
     	    }
      },1000);
      });