var length = 60;
function countdown(that) {
    that.setData({
        captchaDisabled: true,
        captchaLabel: length + '秒后重新发送'
    });
    setTimeout(() => {
        if (length <= 1) {
            length = 60
            that.setData({
                captchaDisabled: false,
                captchaLabel: "获取验证码"
            });
            return false;
        } else {
            length--;
            that.setData({
                captchaDisabled: true,
                captchaLabel: length + '秒后重新发送'
            });
        }
        countdown(that)
    }, 1000)
}
module.exports = countdown