借助tween.js小球沿div四边跑的动画效果

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

    <title></title>

    <style>

        * {

            margin:0;

            padding:0;

        }

        #wrap {

            background-color:#0094ff;

            height:600px;

            width:600px;

        }

        #round {

            height:100px;

            width:100px;

            background-color:#452692;

            border-radius:50%;

            position:absolute;

        }

    </style>

    <script src="tween.js"></script>

</head>

<body>

    <div id="wrap">

        <div id="round"></div>

    </div>

    <script>

        var round = document.getElementById("round");

        function r() {

        var t = 0;

        var b = 0;

        var c = 500;

        var d = 2000;

        var timer = setInterval(run, 20)

        function run() {

            t += 10;

            if (t >= d) {

                clearInterval(timer);

               myfunction();

            }

            round.style.left =Tween.Bounce.easeInOut(t, b, c, d) + "px";

             }

        }

        function myfunction() {

            var t = 0;

            var b = 0;

            var c = 500;

            var d = 2000;

            var timer1 = setInterval(we, 20)

            function we() {

                t += 10;

                if (t>=d) {

                    clearInterval(timer1);

                    myfunc();

                }

                round.style.top =Tween.Bounce.easeInOut(t, b, c, d) + "px";

            }

        }

        function myfunc() {

            var t = 0;

            var b = 0;

            var c = 500;

            var d = 2000;

            var timer2 = setInterval(we, 20)

            function we() {

                t += 10;

                if (t >= d) {

                    clearInterval(timer2);

                    myfun();

                }

                round.style.left =c-Tween.Bounce.easeInOut(t, b, c, d) + "px";

            }

        }

        function myfun() {

            var t = 0;

            var b = 0;

            var c = 500;

            var d = 2000;

            var timer3 = setInterval(we, 20)

            function we() {

                t += 10;

                if (t >= d) {

                    clearInterval(timer3);

                    r();

                }

                round.style.top =c-Tween.Bounce.easeInOut(t, b, c, d) + "px";

            }

        }r();

    </script>

</body>

</html>
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借助tween.js小球沿div四边跑的动画效果

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