60秒倒计时

//发送验证码
$('obj').on('click', function () {
time(this);
});
var wait = 60;
function time(o) {
if (wait == 0) {
o.removeAttribute("disabled");
o.value = "发送验证码";
wait = 60;
} else {
o.setAttribute("disabled", true);
o.value = "重新发送（" + wait + "）";
wait--;
setTimeout(function () {
time(o)
},
1000)
}
}