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="100%;height:100%;">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<style>
* {
padding: 0;
margin: 0;
}
#ball {
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="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>