JS弹弹球

Html

Css

Js

* { margin:0; padding:0; font-family:Microsoft YaHei,serif; } li { list-style:none; } .ball { position:absolute; top:0; left:0; width:100px; height:100px; background:pink; border-radius:50%; }

play(10); function play(num) { //生成num个div for (var i = 0; i < num; i++) { var Div = document.createElement("div"); Div.className = "ball"; Div.leftVal = 3 + i; //预存每个球的初始速度 Div.topVal = 3 + i; //预存每个球的初始速度 Div.style.backgroundColor = randomC(); document.body.appendChild(Div); } var aBall = document.querySelectorAll(".ball"); maxTop = document.documentElement.clientHeight - aBall[0].clientHeight, //获取top的最大值 maxLeft = document.documentElement.clientWidth - aBall[0].clientWidth; //获取left的最大值 window.onresize = function() { maxTop = document.documentElement.clientHeight - aBall[0].clientHeight; //获取top的最大值 maxLeft = document.documentElement.clientWidth - aBall[0].clientWidth; // }; auto(); function auto() { for (var i = 0; i < num; i++) { var Ball = aBall[i], startL = Ball.offsetLeft, //取每个球的初始left和TOP值 startT = Ball.offsetTop, //取每个球的初始left和TOP值 Left = startL + Ball.leftVal, //改变，每个球的left和top值 Top = startT + Ball.topVal; //改变，每个球的left和top值 if (Left >= maxLeft || Left <= 0) { Left = Math.min(Left, maxLeft); //限制Left的最大值 Left = Math.max(Left, 0); //限制最小值 Ball.leftVal = -Ball.leftVal; Ball.style.backgroundColor = randomC(); } if (Top >= maxTop || Top <= 0) { Ball.topVal = -Ball.topVal; Top = Math.min(Top, maxTop); //限制Left的最大值 Top = Math.max(Top, 0); //限制最小值 Ball.style.backgroundColor = randomC(); } Ball.style.top = Top + "px"; Ball.style.left = Left + "px"; } requestAnimationFrame(auto) } // rgb(0-255) function randomC() { var r = Math.floor(Math.random() * 256), g = Math.floor(Math.random() * 256), b = Math.floor(Math.random() * 256); return "rgb(" + r + "," + g + "," + b + ")"; } }

↑上面代码改变，会自动显示代码结果

jQuery调用版本：2.1.4

球球的个数与速度在这里：

play(10);
 
function play(num) {
    //生成num个div
    for (var i = 0; i < num; i++) {
        var Div = document.createElement("div");
        Div.className = "ball";
        Div.leftVal = 3 + i; //速度（水平）
        Div.topVal = 3 + i;
        /速度（垂直）
        Div.style.backgroundColor = randomC();
        document.body.appendChild(Div);
    }