<html>
<header></header>
<script>
var wait=60;
var interValObj;
function fsend(){
interValObj = window.setInterval(setRemainTime, 1000); ///--启动计时器，1秒执行一次
document.getElementById("code_button").disabled=true;
document.getElementById("code_button").innerText="倒计时 " + wait + " 秒";
}
function setRemainTime() {
if (wait == 0) {
window.clearInterval(interValObj); //停止计时器
document.getElementById("code_button").disabled=false;
document.getElementById("code_button").innerText="重新发送验证码" ;
document.getElementById('code_value').value = ''; //清除验证码。如果不清除，过时间后，输入收到的验证码依然有效
wait = 60;
}
else {
wait--;
document.getElementById("code_button").innerText="倒计时 " + wait + " 秒";
}
}
</script>
<body>
Send Scode <input type="text" id="code_value"/>
<button type="button" id="code_button" name="send" onclick="fsend()" >发送验证码</button>
</body>
</html>