飞舞的泡泡球

飞舞的泡泡球
效果图如下
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .container{
            width: 800px;
            height: 800px;
            background-color: #eee;
            margin: 60px auto;
            box-shadow: 5px 8px 2px #bdbdbd inset;
            border: 1px solid #666;
            position: relative;
        }
        .but{
            margin: 0px auto;
            width: 800px;
        }
        .ball{
            border-radius: 50%;
            /*background-color: rgb(157 110 233);*/
            position: absolute;
        }
    </style>
</head>
<body>
    <div class="container" id="cont">
    </div>
        <div class="but"><button id="btn" onclick="pball()">弹球</button></div>
    <script>
        var comobj=document.getElementById('cont');
        function pball(){
            var myWidth = Math.floor(Math.random()*30+10);
            var speY = Math.floor(Math.random()*10-6);
            var speX = Math.floor(Math.random()*10-6);
            var myball=document.createElement("div");
            var mycolorR = Math.floor(Math.random()*255);
            var mycolorB = Math.floor(Math.random()*255);
            var mycolorG = Math.floor(Math.random()*255);
            var contW = comobj.clientWidth;
            var contH = comobj.clientHeight;
            // console.log(mycolorR+','+mycolorG)
            myball.style.backgroundColor = `rgb(${mycolorR} ${mycolorB} ${mycolorG})`;
            myball.style.width = `${myWidth}px`;
            myball.style.height = `${myWidth}px`;
            // console.log(`rgb(${mycolorR} ${mycolorB} ${mycolorG})`);
            myball.className='ball';
            comobj.appendChild(myball);
            myball.style.top = `${contW/2}px`;
            myball.style.left =`${contH/2}px`;
            // console.log( `${comobj.clientWidth/2}px`)
            setInterval(function () {
                var  oftop = myball.offsetTop;
                var  ofleft= myball.offsetLeft;
                var myWid = myball.offsetWidth;
                var myhei = myball.offsetHeight;
                var tp= contH-myhei;
                var lp = contW-myWid;
                var opSy = 0;
                var lpSx = 0;
                opSy = oftop + speY;
                lpSx = ofleft + speX;
                if (opSy<=0)
                {
                    myball.style.top='0px';
                    speY = ~speY;
                } else if (opSy>=tp) {
                    myball.style.top = `${tp}px`;
                    speY = ~speY;
                }else {
                    myball.style.top = `${opSy}px`;
                }
                if (lpSx<=0)
                {
                    myball.style.left='0px';
                    speX = ~speX;
                }else if (lpSx>=lp) {
                    myball.style.left = `${lp}px`;
                    speX = ~speX;
                }else {
                    myball.style.left = `${lpSx}px`;
                }
            },50)
        }
    </script>
</body>
</html>
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