js 验证码倒计时

1.js中使用倒计时用setTimeout()

<input type="button" id="sendCode" value="发送验证码" />

<script type="text/javaacript">

// 验证码 倒计时60秒

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)

}

}

document.getElementById("sendCode").onclick=function(){time(this);}

</script>