<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>计时器</title>
</head>
<body>
<button id="setTime">免费发送短信</button>
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript">
var time=10;
$(document).ready(function(){
$("#setTime").click(function(){
$(this).attr("disabled","disabled");
var span="秒后免费发送短信";
$(this).html(time+span);
var t=setInterval(function(){
time=time-1;
if(time==0){
$("#setTime").html("免费发送短信");
$("#setTime").removeAttr("disabled");
time=10;
clearInterval(t);
}else{
$("#setTime").html(time+span);
}
},1000)
})
})
</script>
</body>
</html>原文：http://zhiaidql.blog.51cto.com/6965969/1585153