Rumah > Artikel > hujung hadapan web > CSS+JS如何制作皮卡丘动画(代码分析)
本篇文章给大家介绍一下CSS+JavaScript制作皮卡丘动画的方法,会一步步给大家介绍使用css如何绘制皮卡丘,如何使用js实现动态效果,让皮卡丘动起来。
简单记录一下思路,有非常多可以优化的地方
利用 transparent
画出合适的三角形
.nose { position: absolute; border: 10px solid black; border-color: black transparent transparent; border-bottom: none; left: 50%; top: 145px; margin-left: -10px; }
再画出三角形上面的半圆共同组成扇形
.yuan { position: absolute; height: 8px; width: 20px; top: -18px; left: -10px; border-radius: 8px 8px 0 0; background-color: black; }
.eye { position: absolute; border: 2px solid #000000; width: 64px; height: 64px; left: 50%; top: 100px; margin-left: -32px; border-radius: 50%; background-color: #2e2e2e; } .eye.left { transform: translateX(-118px); } .eye.right { transform: translateX(118px); }
再画出黑眼睛里面的白眼睛
.eye::after { content: ""; display: block; position: absolute; border: 2px solid black; background: #ffffff; width: 30px; height: 30px; border-radius: 50%; left: 10px; }
制作左边 lip
.mouth .up .lip.left { border: 3px solid black; width: 86px; height: 24px; border-radius: 0 0 0 50px; border-top-color: transparent; border-right-color: transparent; position: relative; transform: rotate(-15deg); position: absolute; left: 50%; margin-left: -50%; }
然后用伪元素遮住鼻子下方的黑色竖线
.mouth .up .lip.left::before { content: ""; display: block; width: 5px; height: 30px; position: absolute; right: -4px; bottom: 0px; background-color: #ffdb00; }
同样原理制作右 lip
.mouth .up .lip.right { border: 3px solid black; width: 86px; height: 24px; border-radius: 0 0 50px 0; border-top-color: transparent; border-left-color: transparent; position: relative; transform: rotate(15deg); position: absolute; right: 50%; margin-right: -50%; }
.mouth .up .lip.right::before { content: ""; display: block; width: 5px; height: 30px; position: absolute; left: -4px; bottom: 0px; background-color: #ffdb00; }
制作下嘴唇
.mouth .down { border: 1px solid red; height: 166px; width: 100%; position: relative; overflow: hidden; } .mouth .down .yuan1 { border: 1px solid black; position: absolute; width: 124px; height: 1000px; left: 50%; margin-left: -62px; bottom: 0; border-radius: 85px/280px; background: #9b000a; }
然后在 .mouth .up .lip 中 加入和 body 一样的背景 然后画里面的部分和红脸颊
.mouth .down .yuan1 .yuan2 { border: 1px solid red; position: absolute; width: 150px; height: 300px; background: #fa595b; left: 50%; margin-left: -75px; bottom: -165px; border-radius: 100px; } .face { border: 3px solid black; position: absolute; width: 88px; height: 88px; left: 50%; margin-left: -44px; top: 210px; } .face.left { transform: translateX(-166px); border-radius: 50%; background: #ff0000; } .face.right { transform: translateX(166px); border-radius: 50%; background: #ff0000; }
给鼻子添加动画效果
@keyframes wave { 0% { transform: rotate(0); } 33% { transform: rotate(6deg); } 66% { transform: rotate(-6deg); } 100% { transform: rotate(0); } } .nose:hover { transform-origin: center bottom; animation: wave 220ms infinite linear; }
让一个数字自动一直加 1
test.html
和 test.js
let n = 1; demo.innerHTML = n; setInterval(() => { n += 1; demo.innerHTML = n; }, 1000);
下面就可以写一段话,一个字一个字的出现
const string = "大家好,我是你们的老朋友"; let n = 1; demo.innerHTML = string.substr(0, n); setInterval(() => { n += 1; demo.innerHTML = string.substr(0, n); }, 300);
但是上面代码还存在 bug ,打出 n ,会发现当字显示完了之后,n 还是一直增加,我们只需要在显示完字之后取消计时器即可,取消计时器方法如下
const string = "大家好,我是你们的老朋友"; let n = 1; demo.innerHTML = string.substr(0, n); let id = setInterval(() => { n += 1; if (n > string.length) { window.clearInterval(id); return; } demo.innerHTML = string.substr(0, n); }, 300);
知道了一个字一个字显示的原理,接下来显示我们的 CSS。
test.html 中准备两个 div ,一个用来写 CSS 标签,一个用来将 CSS 内容显示在页面上。
但是,这样之后还是有一个有问题,显示的动画被文字顶下去了。 如图所示
在 test.html 中加入下面代码
<style> #html { position: absolute; bottom: 0; left: 0; width: 100%; height: 50vh; } </style>
我们解决了如何让动画的问题,又出现了代码看不见的问题,接下来解决怎么让滚动条自动往下滚,并且动画固定不动
html 的内容是不需要被用户看见的,可以直接隐藏
<style> #demo2 { display: none; } #demo{ position: fixed; height: 50vh; top: 0; left: 0; width: 100%; overflow-y: auto; } #html { position: absolute; bottom: 0; left: 0; width: 100%; height: 50vh; } </style>
在 test.js 更新代码,让滚动条自动往下滚
let id = setInterval(() => { n += 1; if (n > string.length) { window.clearInterval(id); return; } demo.innerText = string.substr(0, n); demo2.innerHTML = string.substr(0, n); demo.scrollTop = demo.scrollHeight; //更新了这里 }, 0);
隐藏滚动条之后,用户依然可以滚动内容
#demo::-webkit-scrollbar { display: none; }
添加播放、暂停、慢速、中速、快速按钮
刷新后,发现按钮先变大再复原,这是因为 CSS reset 影响到按钮,在 test,js 中更新代码
将样式分为两块,互不影响
.skin * { margin: 0; padding: 0; box-sizing: border-box; } .skin *::before, *::after { box-sizing: border-box; } .skin { background: #ffdb00; min-height: 50vh; position: relative; }
3.思路
btnSlow.onclick = () => { window.clearInterval(id); time = 300; id = setInterval(() => { run(); }, time); }; // 等价于 btnSlow.onclick = () => { window.clearInterval(id); time = 300; id = setInterval(run, time); };
完整优化如下
暂停; btnPause.onclick = () => { window.clearInterval(id); }; 播放; btnPlay.onclick = () => { id = setInterval(() => { run(); }, time); }; 慢速; btnSlow.onclick = () => { window.clearInterval(id); time = 300; id = setInterval(() => { run(); }, time); }; 中速; btnNormal.onclick = () => { window.clearInterval(id); time = 50; id = setInterval(() => { run(); }, time); }; 快速; btnFast.onclick = () => { window.clearInterval(id); time = 0; id = setInterval(() => { run(); }, time); };
上面代码优化结果如下↓↓↓
const run = () => { n += 1; if (n > string.length) { window.clearInterval(id); return; } demo.innerText = string.substr(0, n); demo2.innerHTML = string.substr(0, n); demo.scrollTop = demo.scrollHeight; }; const play = () => { return setInterval(run, time); }; let id = play(); const pause = () => { window.clearInterval(id); }; //暂停 btnPause.onclick = () => { pause(); }; // 播放 btnPlay.onclick = () => { id = play(); }; //慢速 btnSlow.onclick = () => { pause(); time = 300; id = play(); }; //中速 btnNormal.onclick = () => { pause(); time = 50; id = play(); }; //快速 btnFast.onclick = () => { pause(); time = 0; id = play(); };
例如
btnSlow.onclick = () => { slow(); }; //等价 btnSlow.onclick = slow;
const play = () => { return setInterval(run, time); }; let id = play(); const pause = () => { window.clearInterval(id); }; const slow = () => { pause(); time = 300; id = play(); }; const normal = () => { pause(); time = 50; id = play(); }; const fast = () => { pause(); time = 0; id = play(); };
const player = { run: () => { n += 1; if (n > string.length) { window.clearInterval(id); return; } demo.innerText = string.substr(0, n); demo2.innerHTML = string.substr(0, n); demo.scrollTop = demo.scrollHeight; }, play: () => { return setInterval(player.run, time); }, pause: () => { window.clearInterval(id); }, slow: () => { player.pause(); time = 300; id = player.play(); }, normal: () => { player.pause(); time = 50; id = player.play(); }, fast: () => { player.pause(); time = 0; id = player.play(); }, };
.....
bindEvents: () => { document.querySelector("#btnPause").onclick = player.pause; document.querySelector("#btnPlay").onclick = player.play; document.querySelector("#btnSlow").onclick = player.slow; document.querySelector("#btnNormal").onclick = player.normal; document.querySelector("#btnFast").onclick = player.fast; } //
把一堆代码放到一个文件里导出,在导入
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