验证码再次发送

//启动验证码倒计时
function StartInterval(buttonid) {
    var button = document.getElementById(buttonid);
    if (button) {
        button.disabled = true;
        var timeoutTick = 180;
        var t1 = window.setInterval(function () {

            if (timeoutTick < 0) {
                timeoutTick = 180;
                button.innerHTML = "再次发送";
                button.disabled = false;
                window.clearInterval(t1);
                t1 = null;
            }
            else {
                button.innerHTML = timeoutTick + "s";
                timeoutTick--;
            }
        }, 1000);
    }
}