html计时发送验证码功能的实现

        function countdown()

        {

            var time=60;

            setTime=setInterval(function(){

                if(time<=0){

                    clearInterval(setTime);

                    $('.sendcode').attr("disabled", false);

                    $('.sendcode').text("发送验证码");

                    return;

                }

                time--;

                $('.sendcode').text(time+'s后重试');

            },1000);

        }

        $('.sendcode').click(function () {

            $('.error_msg').html("");

            var mobile = $('#mobile').val();

            $.ajax({

                type: 'POST',

                url: 'send_code_for_admin_login',

                data: {mobile:mobile},

                dataType: 'json',

                success:function(data){

                    if (data.code != 0) {

                        $('.error_msg').html("<font color='red'>"+data.message+"</font>");

                    }

                    if (data.code == 30001 || data.code == 0) {

                        $('.sendcode').attr("disabled", "disabled");

                        countdown();

                    }

                },

            });

        });