60秒倒计时

<button type="button" name="button">点击获取验证码</button>

   $("button[name='button']").click(function(event) {
            //这里写发送验证码的代码
            var time = 60;
            settime($(this));
            function settime(obj){
                if (time==0) {
                    $(obj).attr('disabled', false);
                    $(obj).html("点击获取验证码");
                    time = 60;
                    return;
                } else{
                    $(obj).attr('disabled', true);
                    $(obj).html(time+"秒后重新发送");
                    time--;
                }
                setTimeout(function() {
                    settime(obj)
                },1000)
            }
        });