js获取短信验证码按钮倒计时代码

  (function(){
        // 快速咨询
        $('#getCode').click(function() {
            var mobile = $('#mobile').val();//手机号码的值
            var _this = $(this);
            var mobileReg = /^1[3|4|5|7|8]\d{9}$/; //手机号正则
            var phoneflag = mobileReg.test(mobile);

            if (!phoneflag) {
                alert('手机号码格式不正确！');
            } else {

                //User/getCode.html这个是后台接口

                $.post("/User/getCode.html", {
                    mobile: mobile
                }, function(data) {
                    _this.attr("disabled", "disabled");
                        _this.css({background:"#eee"});//设置不可点颜色
                    var val = parseInt(_this.val());
                    var time = 60;
                    _this.val(time + " S");
                    time--;

                    var timer = setInterval(function() {
                        val = time + " S";
                        _this.val(val);
                        if (time > 0) {
                            time--;
                        } else {
                            //原始颜色
                            _this.val("获取验证码").removeAttr("disabled").css({background:"#66CCFF"});;
                            clearInterval(timer);
                        }
                    }, 1000);
                });
            }

        });
    })();