时间：2020-12-12 09:47:19 | 栏目：JavaScript代码 | 点击：次
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.box2{}
.box2{width: 200px; height: 200px; background: red; border-radius: 50%;position: relative;}
.box3{width: 800px; height: 500px; border:1px solid red;}
</style>
</head>
<body>
<button type="" id="start">开始</button>
<button type="" id="stop">停止</button>
<div class="box3">
<div id="box" class="box2">
</div>
</div>
</body>
<script type="text/javascript">
var lr=600;
var tb=300;
var i=0;
var j=0;
var box=document.getElementById('box');
var start=document.getElementById('start');
var stop=document.getElementById('stop');
start.onclick=function(){
start.style.display='none';
stop.style.display='inline';
var time=setInterval(function(){
box.style.left=i+'px';
box.style.top=j+'px';
if (i>lr) {
lr=0;
i--;
}
if(i<=lr){
lr=600;
i++;
}
if (j>tb) {
tb=0;
j--;
}
if (j<=tb) {
tb=300;
j++
}
stop.onclick=function(){
clearInterval(time);
stop.style.display='none';
start.style.display='inline';
}
},5);
}
</script>
</html>