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实例

<!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>

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Correction status：qualified

Teacher's comments：写得还行

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7月9号作业

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