让按钮倒计时5秒以后才能再次点击提交 倒计时 倒计时按钮
<script type="text/javascript">
var n = 0;
var intervalID;
function setEnable(){
n++;
if(n==5){
btn.disabled = false;
// 有时稍后
clearInterval(intervalID);
}else{
btn.value = "我同意（"+(5-n)+ "）";
}
}
intervalID = window.setInterval("setEnable()",1000);
</script>
<input type="button" id="btn" name="btn" value="Button" disabled="disabled" />
if(n==5){
btn.disabled = false;
// 有时稍后
clearInterval(intervalID);
}else{
btn.value = "我同意（"+(5-n)+ "）";
}
}
intervalID = window.setInterval("setEnable()",1000);
</script>
<input type="button" id="btn" name="btn" value="Button" disabled="disabled" />