html 按钮点击倒计时，限制不可点击

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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title></title></head><body><!-- VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV --><!-- VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV --><input type="button" style="height:32px;width:120px;" value="点击发送验证码" onclick="sendCode(this)" /><script type="text/javascript">var clock = '';var nums = 3;var btn;function sendCode(thisBtn) {btn = thisBtn;btn.disabled = true; //将按钮置为不可点击btn.value = nums + '秒后可重新获取';clock = setInterval(doLoop, 1000); //一秒执行一次}function doLoop() {nums--;if (nums > 0) {btn.value = nums + '秒后可重新获取';} else {clearInterval(clock); //清除js定时器btn.disabled = false;btn.value = '点击发送验证码';nums = 3; //重置时间}}</script><!-- AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA --><!-- AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA --></body></html>

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