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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
#box{width:100px;height:100px;background:pink;position:absolute;}
</style>
</head>
<body>
<!-- <div id="box" style="left:0px;top:0px;"></div> -->
<img src="./3.jpg" alt="" style="left:0px;top:0px;" id="box">
</body>
<script>
var box = document.getElementById('box');
var x = 10;
var y = 10;
setInterval(function(){
//控制div碰到横向的边界地方进行反向移动
if(parseInt(box.style.left)>= (window.innerWidth-100) ){
x = -x;
}
if(parseInt(box.style.left)<0){
x = -x;
}
//控制div碰到纵向的边界的地方进行反向移动
if(parseInt(box.style.top)>= (window.innerHeight-100) ){
y = -y;
}
if(parseInt(box.style.top)<0){
y = -y;
}
//让我们的div开始移动
box.style.left = parseInt(box.style.left)+x+'px';
box.style.top = parseInt(box.style.top) +y+'px';
},100)
</script>
</html>点击 "运行实例" 按钮查看在线实例
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