按钮倒计时后才可以点击的效果

<script language="javascript">
	var speed = 1000; //速度
	var wait = 6;
	function updateinfo(){
		document.getElementById("getcode").disabled = true;
		if(wait == 0){
			document.getElementById("getcode").disabled = false;
			document.getElementById("getcode").innerHTML = "获取验证码";
		} else {
			document.getElementById("getcode").innerHTML = "输入验证码" + wait;
			wait--;
			window.setTimeout("updateinfo()",speed);
		}
	}
	</script>

<button id="getcode" onclick="updateinfo()">获取验证码</button>