//发送验证码
    $('.js-sms-code').click(function(){
        $(this).attr("disabled", "disabled").html("<span style='color:#666'><span id='countdown'>60</span>s 后再试</span>");
        countdown();
        var tel = $('#tel').val();
        $.ajax({
            url: "{sh::U('Home/sendSmscode')}",
            type:'POST',
            dataType:"json",
            data: {tel: tel},
            success: function() {
            },
            error: function() {
                $('.js-help-info').html("请求失败");
            }
        });
    })

function countdown() { // 递归
    setTimeout(function() {
        var time = $("#countdown").text();
        
        if (time == 1) {
            $('.js-sms-code').removeAttr("disabled");
            $('.js-sms-code').html("发送验证码");
        } else {
            $("#countdown").text(time - 1);
            countdown();
        }
    }, 1000);
}