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老师批语：写得还行
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>定时器</title>
</head>
<body>
<button>登录</button>
<button>取消</button>
<p></p>
<hr>
<button>播放</button>
<button>停止</button>
<hr>
<div style="width: 400px; height: 300px; background-color:lemonchiffon ;">我不是广告</div>
<p id="res"></p>
<script>
var btn1=document.getElementsByTagName('button').item(0);
var btn2=document.getElementsByTagName('button').item(1);
var tips=document.getElementsByTagName('p').item(0);
var timer =null;
btn1.addEventListener('click',login,false);
function login() {
tips.innerText='正中跳转中...';
timer=setTimeout(function () {
location.assign('http://www.baibu.com');
},3000);
console.log(timer);
}
btn2.addEventListener('click',function (ev) {
clearTimeout(timer);
tips.innerText=null;
console.log(timer);
});
setInterval(function(){...}num)
var btn3=document.getElementsByTagName('button').item(2);
var btn4=document.getElementsByTagName('button').item(3);
var img=document.images.item(0)
btn3.addEventListener('click',play,false);
function play() {
timer= setInterval(function () {
var index=Math.ceil(Math.random()*3);
img.src='images/banner'+index+'.jpg';
console.log(img.src);
},1000);
}
btn4.addEventListener('click',function (ev) {
clearInterval(timer);
},false);
var div=document.getElementsByTagName('div').item(0);
var res=document.getElementById('res');
var num=0;//点击 次数
var price=0.5;
//事件模拟
var click=new Event('click');
setInterval(function () {
div .dispatchEvent(click);
num+=1;
console.log(num);
//输出收入情况
res.innerHTML='广告收入：'+'<span style="color: red">'+(num * price)+'</span>'+'元';
},2000);
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
![X8YQI]RSL8AB]`5NLX@H]$J.png](https://img.php.cn/upload/image/734/404/983/1563504460441094.png "1563504460441094.png")
![4X)}{]WC(C4S14[YTWA08BA.png](https://img.php.cn/upload/image/280/684/907/1563504464453878.png "1563504464453878.png")
![X8YQI]RSL8AB]`5NLX@H]$J.png](https://img.php.cn/upload/image/560/666/956/1563504472711141.png "1563504472711141.png")
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