发送验证码倒计时60s

var wait=60;

function time(o) {

        if (wait == 0) {

            o.removeClass("gray");

            o.text("发送验证码");

            wait = 60;

        } else {

            o.addClass("gray");

            o.text("重新发送(" + wait + ")s");

            wait--;

            setTimeout(function() {

                time(o)

            },

            1000)

        }

    }