验证码倒计时

var wait=60;  

function time(o) {

if (wait == 0) {

o.removeAttribute("disabled");

o.value="获取验证码";

wait = 60;

} else {

o.setAttribute("disabled", true);

o.value="重新发送(" + wait + ")";

wait--;  

setTimeout(function() {

time(o)

},

            1000)

}

}