console 命令行工具 X clear

console

var start = null;
var num=0;
var element = document.getElementById('SomeElementYouWantToAnimate');

function step(timestamp) {
  if (!start) start = timestamp;
  var progress = (timestamp - start)%2000;
  
  element.style.left = Math.min(progress*(Math.sin(num+=0.01)) / 10, 200) + 'px';
	window.requestAnimationFrame(step);

}

window.requestAnimationFrame(step);

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Document</title>
</head>
<body>
  <div id="SomeElementYouWantToAnimate"></div>
  <div class="test"></div>
</body>
</html>

#SomeElementYouWantToAnimate {
  width: 20px;
  height: 20px;
  background: #555;
   position: relative;
}
.test{
  display:inline-block;
  width: 50px;
  height: 50px;
  background-color:#888;
  background-clip:padding-box;
  border-radius:50%;
  border:5px solid;
  padding: 15px;
}


.test:hover {
  font-size: 40px;
}