js实现抛物线

这个是很简单的一种方式，利用了css3的transition属性
<!DOCTYPE html>

<html lang="en" style="width:100%;height:100%;">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width">

    <style>

        * {

            padding: 0;

            margin: 0;

        }

        #ball {

            width:12px;

            height:12px;

            background: #5EA345;

            border-radius: 50%;

            position: fixed;

            transition: left 1s linear, top 1s ease-in;

        }

    </style>

    <title>CSS3 水平抛物线动画</title>

</head>

<body style="width:100%;height:100%;">

    <div id="ball"></div>

</body>

<script>

    var $ball = document.getElementById('ball');

    document.body.onclick = function (evt) {

        console.log(evt.pageX,evt.pageY)

        $ball.style.top = evt.pageY+'px';

        $ball.style.left = evt.pageX+'px';

        $ball.style.transition = 'left 0s, top 0s';

        setTimeout(()=>{

            $ball.style.top = window.innerHeight+'px';

            $ball.style.left = '0px';

            $ball.style.transition = 'left 1s linear, top 1s ease-in';

        }, 20)

    }

</script>

</html>