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playball.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>球球来回弹</title>
</head>
<style type="text/css">
body{position:relative;}
.box{width:200px;height:200px;border:1px solid black;position:absolute;top:100px;left:40px;}
.box .ball{background:red;width:20px;height:20px;border-radius:50%;position:absolute;left:100px;top:10px;display:none;}
.boxtwo{width:400px;height:400px;border:1px solid black;position:absolute;top:100px;left:340px;}
.boxtwo .balltwo{background:red;width:20px;height:20px;border-radius:50%;position:absolute;left:100px;top:0px;display:none;}
</style>
<body>
</body>
<script>
// 1.产生随机数，让球来回滚动
function Balloon(){
var that = this;
that.box = document.createElement("div");
that.box.className = "box";
that.ball = document.createElement("div");
that.ball.className = "ball";
document.body.appendChild(that.box);
that.box.appendChild(that.ball);
that.move();
}
Balloon.prototype.move = function(){
var that = this;
var randomx = parseInt(Math.random() * (parseInt(getComputedStyle(that.box,false)["width"]) - parseInt(getComputedStyle(that.ball,false)["width"])));
var randomy = parseInt(Math.random() * (parseInt(getComputedStyle(that.box,false)["width"]) - parseInt(getComputedStyle(that.ball,false)["height"])));
that.ball.style.display = "block";
var oleft = parseInt(getComputedStyle(that.ball,false).left);
var otop = parseInt(getComputedStyle(that.ball,false).top);
that.timer = setInterval(function(){
if(oleft < randomx){
oleft += 1;
}else if(oleft > randomx){
oleft -= 1;
}else if (oleft == randomx){
randomx = parseInt(Math.random() * (parseInt(getComputedStyle(that.box,false)["width"]) - parseInt(getComputedStyle(that.ball,false)["width"]))) + 1;
};
if(otop < randomy){
otop += 1;
}else if(otop > randomy){
otop -= 1;
}else if (otop == randomy){
randomy = parseInt(Math.random() * (parseInt(getComputedStyle(that.box,false)["width"]) - parseInt(getComputedStyle(that.ball,false)["height"]))) + 1;
};
that.ball.style.left = oleft + "px";
that.ball.style.top = otop + "px";
},30)
}
var running = new Balloon();
// 2.球撞到盒子边缘产生随机数，紧贴边缘；
function Balltwo(){
var that = this;
that.box = document.createElement("div");
that.box.className = "boxtwo";
that.ball = document.createElement("div");
that.ball.className = "balltwo";
document.body.appendChild(this.box);
this.box.appendChild(this.ball);
that.move();
}
Balltwo.prototype.move = function(){
var that = this;
that.ball.style.left = parseInt(Math.random() * 300) + "px";
that.ball.style.top = parseInt(Math.random() * 300) + "px";
that.top = parseInt(that.ball.style.top);
that.left = parseInt(that.ball.style.left);
that.ball.style.display = "block";
that.lbl = parseInt(Math.random() * 2)==1?true:false;
that.tbl = parseInt(Math.random() * 2)==1?true:false;
that.w = that.box.offsetWidth - that.ball.offsetWidth;
that.h = that.box.offsetHeight - that.ball.offsetHeight;
that.timer = setInterval(function(){
if(that.lbl == true){
if(that.left < that.w) {
that.left+=2;
}else{
that.lbl = false;
}
}else{
if(that.left > 0){
that.left-=2;
}else{
that.lbl = true;
}
}
if(that.tbl == true){
if(that.top < that.h) {
that.top+=2;
}else{
that.tbl = false;
}
}else{
if(that.top > 0){
that.top-=2;
}else{
that.tbl = true;
}
}
that.ball.style.top = that.top + "px";
that.ball.style.left = that.left + "px";
},10);
};
function Ballthr(){
this.ball.style.background = "green";
}
function Ballfour(){
this.ball.style.background = "blue";
}
function Ballfive(){
this.ball.style.background = "greenyellow";
}
function Ballsix(){
this.ball.style.background = "violet";
}
Ballthr.prototype = new Balltwo();
Ballfour.prototype = new Balltwo();
Ballfive.prototype = new Balltwo();
Ballsix.prototype = new Balltwo();
var run1 = new Balltwo();
var run2 = new Ballthr();
var run3 = new Ballfour();
var run4 = new Ballfive();
var run5 = new Ballsix();
</script>
</html>