简易的计时器实例,可以模拟注册协议倒计时同意

来源:互联网 发布:日照城市知乎 编辑:程序博客网 时间:2024/04/29 01:24
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
 <script type="text/javascript">
var a=3;
  var jishi=function()
{
document.getElementById("agr").value = a+"秒后可以同意";
     a--;
if(a ==0) { 
clearTimeout(null);
document.getElementById("agr").style.color="red";
document.getElementById("agr").disabled=false;
document.getElementById("agr").value = "同意";
a=3;
}else{
  setTimeout(jishi,1000);
   }
}
function tongyi(){
alert("同意");
}


  </script>
</head>
  <body onload="jishi()">
    <input type="button" id="agr" disabled="disabled" onclick="tongyi()" value="同意"/>
</body>
</html>
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