本文实例为大家分享了JavaScript实现多球运动的具体代码，供大家参考，具体内容如下
代码如下：
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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>多球运动</title> <style> *{margin:0;padding:0;} body{background-color: #90f;} .ball{position: absolute;left:0;top:0;width:100px;height:100px;background: #f0f;border-radius: 50%;} </style></head><body> <script> run(22)//封装 //定义速度 var speed; function run(num){ //创建出num个div for(var i=0;i<num;i++){ //[2,11) 随机速度 speed = Math.floor(Math.random()*9+2); //创建生成节点 var div = document.createElement("div"); //添加类名 div.className = 'ball' //自定义属性保存值 div.speedX = Math.floor(Math.random()*9+2) div.speedY = Math.floor(Math.random()*9+2) //将div放置到body中 document.body.appendChild(div) } //获取元素 var box = document.getElementsByClassName( "ball" ) //获取文档可视区域的宽高 var maxX = document.documentElement.clientWidth - box[0].offsetWidth; var maxY = document.documentElement.clientHeight - box[0].offsetHeight; //自适应窗口 window.onresize = function(){ maxX = document.documentElement.clientWidth - box[0].offsetWidth; maxY = document.documentElement.clientHeight - box[0].offsetHeight; } play() function play(){ for(var i=0;i<num;i++){ //获取 var ball = box[i]; var startTop = ball.offsetTop; var startLift = ball.offsetLeft; //startTop都为零； var top = startTop + ball.speedY; var left = startLift + ball.speedX; //判断小球是否出左右边界 if(left <= 0 || left >= maxX){ //改变方向 ball.speedX = -ball.speedX; ball.style.background=randomColor() //判断 if(left <= 0){ left = 0; }else if(left >= maxX){ left = maxX; } } //判断小球是否出上下边界 if(top <= 0 || top >= maxY ){ // 改变方向； ball.speedY = -ball.speedY; ball.style.background=randomColor() //判断 if( top <= 0 ){ top = 0; }else if( top >= maxY ){ top = maxY; } } ball.style.top = top + "px"; ball.style.left = left + "px"; } //执行动画帧 requestAnimationFrame(play); } //颜色随机 function randomColor() { var r = Math.floor(Math.random() * 256), g = Math.floor(Math.random() * 256), b = Math.floor(Math.random() * 256); return "rgb(" + r + "," + g + "," + b + ")"; } } </script></body></html> |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/javaScript1997/article/details/108385955
