js 短信60秒倒计时

<a href="javascript:void(0);" id="gSMS" onclick="get_sms_captcha(‘2‘)" style="font-size: 0.6rem;color: #444;left: 0.5rem;">获取短信验证码</a> 

var countDownT = 60;
function get_sms_captcha(type){
    countDownT = 60;
    setTime();
    //下方写业务
}

function  setTime(){
    if (countDownT == 0){
        $("#gSMS").attr("onclick","get_sms_captcha(‘2‘)");
        $("#gSMS").text("获取短信验证码");
    } else{
        $("#gSMS").attr("onclick","#");
        $("#gSMS").text("重新发送("+countDownT+")");
        countDownT--;
        setTimeout(function () {
            setTime();
        },1000)
    }
}