哪里有问题

来源：1-26 编程练习

Sherlock_bourne

2019-04-21 15:56:58

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>setInterval()</title>
        <style type="text/css">
            div{
                width:300px;
                height:300px;
                border:1px solid #333;
            }
        </style>
    </head>
    <body>
        <input type="button" value="开始">
        <br><br>
        <div></div>
        <script type="text/javascript">
           //补充代码
           var btn=document.getElementsByTagName("input")[0];
           var div=document.querySelector("div");
           var timer=null;
           var i=0;
           btn.addEventListener("click",function(){
               timer=setInterval(function(){
                   div.innerHTML+="'hello'+' '";
                   i++;
                   if(i>=15){
                       stop.onclick;
                   }
               },1000);
               
           })
        </script>
    </body>
</html>

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