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编写涉及：css, html, js
在线演示 codepen
html 代码
<div class=”roll-box”>
<div class=”inner-box”>move</div>
</div>
<button onclick=”startMove()”> start move</button>
css 代码
.roll-box {
position: relative;
width: 600px;
height: 400px;
background: #007acc;
overflow: hidden;
color: #fff;
}
.inner-box {
position: absolute;
top: 10px;
left: 0;
width: 50px;
height: 50px;
text-align: center;
line-height: 50px;
background-color: rgb(245, 152, 30);
}
button{
margin-top: 20px;
padding: 6px 10px;
border: 0;
color: #fff;
background-color: rgb(39, 133, 240);
}
JavaScript 代码
let moveCount = 0;
let rafId = ”;
const ele = document.querySelector(‘.inner-box’);
window.requestAniFrame = (function () {
return window.requestAnimationFrame
// Older versions Chrome/Webkit
window.webkitRequestAnimationFrame ||
// Firefox < 23
window.mozRequestAnimationFrame ||
// opera
window.oRequestAnimationFrame ||
// ie
window.msRequestAnimationFrame ||
function (callback) {
return window.setTimeout(callback, 1000 / 60);
};
})()
window.cancelAnimation = (function () {
return window.cancelAnimationFrame || window.mozCancelAnimationFrame || window.cancelRequestAnimationFrame || function (id) {clearTimeout(id) }
})()
function moveFn() {
ele.setAttribute(‘style’, ‘left:’ + moveCount + ‘px’);
moveCount++
if (moveCount > 550) {
window.cancelAnimation(rafId)
} else {
rafId = window.requestAniFrame(moveFn)
}
}
function startMove() {
// 必须先清除，否者多次点击会生成多个动画帧，导致元素移动速度加快
window.cancelAnimation(rafId)
rafId = window.requestAniFrame(moveFn)
}
若有疑问或错误，请留言，谢谢！Github blog issues