<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title></title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
button {
width: 80px;
height: 30px;
margin: 40px;
}
div>span {
display: inline-block;
width: 60px;
height: 60px;
background-color: red;
font-size: 28px;
line-height: 60px;
text-align: center;
color: #fff;
border-radius: 50%;
margin: 6px;
}
</style>
<script type="text/javascript">
window.onload = function() {
var btnS = document.getElementsByTagName('button');
var ballS = document.getElementsByTagName('span');
var timer = null;
btnS[0].onclick = function() {
btnS[0].disabled = true;
btnS[1].disabled = false;
timer = setInterval(sj, 40);
}
btnS[1].onclick = function() {
console.log(idx);
if(idx >=6){
idx=0;
btnS[0].disabled = false;
btnS[1].disabled = true;
clearInterval(timer);
return 0;
}
setTimeout(function() {
idx++;
}, 1000);
}
var idx = 0;
function sj() {
for (var i = idx; i < 7; i++) {
a = Math.floor(Math.random() * 100);
ballS[i].innerText = a;
}
}
}
</script>
</head>
<body>
<button type="button">開始</button>
<button type="button">停止</button>
<div>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
</body>
</html>
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