今天我们来折纸飞机（可以飞出去的那种哦）

基本全用css来实现，只有一小部分的js

首先看一下飞机的构造

灰色区域为可折叠区域

白色区域为机身

三角形由border画出来的再经过各种平移翻转变成上图

写之前再补充个知识点：

我们颜色的设置不用rgba，

用hsl() h: 色调 0- 360 0(或360)表示红色，120表示绿色，240表示蓝色

s ： 饱和度 0% -100%

l : 亮度 0% - 100%

先看效果才有动力：

HTML:

<!--童年的纸飞机--><div class="airplane"> <div class="front-end show-front"> <!--宽高自适应的文本框--> <div class="text-input" contenteditable = true></div> <div class="fly"> fly </div> </div> <div class="backup-end show-backup"> <div class="left-plane"> <!--左上角折叠区域--> <div class="left-top fold"></div> <!--左下角折叠区域--> <div class="left-bottom fold"></div> <!--机身--> <div class="wing wing1"></div> <div class="wing wing2"></div> </div> <div class="right-plane"> <!--右上角折叠区域--> <div class="right-top fold"></div> <!--右下角折叠区域--> <div class="right-bottom fold"></div> <!--机身--> <div class="wing wing3"></div> <div class="wing wing4"></div> </div> </div></div>

css:

body{ width: 100%; height: 680px; background-color: #000; background-repeat: no-repeat; overflow: hidden; transition: all 2s linear;}/*景深加在父级上*/.airplane{ width: 100%; height: 100%; -webkit-perspective: 800px; -webkit-perspective-origin: 50% 50%;}/*纸飞机前面*//*一开始不旋转*/.front-end.show-front{ transform: rotateY(0deg);}/*点击后旋转*/.front-end{ background: rgba(255, 255, 255, 0.15); *background: hsl(0, 0%, 88%); /*绕Y轴旋转-180度*/ transform: rotateY(-180deg); position: relative; box-sizing: border-box; padding: 20px; text-align: center; backface-visibility: hidden; width: 400px; height: 260px; top: 240px; transition: all 0.8s ease-in-out; margin: auto;}/*文本框*/.text-input{ width: 100%; max-width:360px; min-height:100px; padding: 10px; box-sizing: border-box; height: 140px; background-color: #ffffff; font-smoothing: subpixel-antialiased; font-size: 18px; text-align: left; font-family: "Microsoft YaHei",Helvetica, Arial, Verdana; line-height: 20px;}.fly{ transition: all 0.3s ease-in-out; /*hsl是色调/饱和度/亮度/*/ border: 2px solid hsl(194, 100%, 72%); margin: 15px 0; padding: 10px; outline: none; font-size: 18px; cursor: pointer; font-family: "Microsoft YaHei"; background-color: hsl(0, 0%, 94%); border-radius:4px; user-select: none;}/*点击按钮时缩小动画*/.fly:active{ transform: scale(0.85); transition: all 10ms ease-in-out; background-color: hsl(0, 0%, 85%); border: 2px solid hsl(194, 30%, 55%);}.backup-end{ perspective: 600px; perspective-origin: 200px 131px; transform-style: preserve-3d; transition: all 0.8s ease-in-out; backface-visibility: hidden; position: relative; width: 400px; height: 260px; margin: auto;}/*一开始不显示飞机*/.backup-end.show-backup{ transform: rotateY(180deg);}/*飞机的左右两边公共样式*/.left-plane, .right-plane{ transform-style: preserve-3d; width: 200px; height: 260px; display: block; position: absolute; top: 0px; transition: all 1s ease-in-out;}/*左边*/.left-plane{ transform: rotateZ(0deg); transform-origin: 100% 50% 0; left: 0;}/*右边*/.right-plane{ transform: rotateZ(0deg); transform-origin: 0% 50%; left: 199px;}/*左右机身的公共样式*/.wing{ position: absolute; transform-origin: 0 0 0; perspective: 1px; perspective-origin: 50% 50%; backface-visibility: hidden; transition: all 1.3s linear; box-sizing: border-box; margin: 0; padding: 0; background: none; border: none; border-top: 240px solid hsla(0, 0%, 0%, 0); border-bottom: 0px solid hsla(0, 0%, 0%, 0); border-right: 100px solid hsl(0, 0%, 88%); width: 0; height: 0; bottom: 0;}/*绘制 飞机2d 雏形*/.wing1 { transform-origin: 100% 100%; transform: translateY(-38px) translateX(8px) rotateZ(22.62deg) skewY(-22.62deg);/*2D图像的偏移 旋转*/}.wing2 { transform: rotateZ(22.62deg); transform-origin: 100% 100%; border-left: 100px solid hsl(0, 0%, 88%); border-right: none; left: 100px;}.wing3 { transform: rotateZ(-22.62deg); transform-origin: 0% 100%; border-right: 100px solid hsl(0, 0%, 88%);}.wing4 { transform: translateY(-38px) translateX(-8px) rotateZ(-22.62deg) skewY(22.62deg); transform-origin: 0% 100%; border-right: none; border-left: 100px solid hsl(0, 0%, 88%); left: 100px;}/*绘制可折叠区域*/.left-top.fold{ position: absolute; transform-origin: 100px 112px; transition-delay: 1300ms; width: 0; height: 0; top: 0; border-right: 202px solid hsla(0, 0%, 0%, 0); border-bottom: 202px solid hsla(0, 0%, 0%, 0); border-top: 222px solid hsl(0, 0%, 88%);}.right-top.fold{ position: absolute; right: 0; border-left: 202px solid hsla(0, 0%, 0%, 0); border-bottom: 202px solid hsla(0, 0%, 0%, 0); border-top: 222px solid hsl(0, 0%, 88%); transform-origin: 96px 112px; transition-delay: 1650ms;}.left-bottom.fold{ position: absolute; transform-origin: 109px 0; transition-delay: 2100ms; width: 109px; height: 38px; background: hsl(0, 0%, 88%); bottom: 0; left: 0;}.right-bottom.fold{ position: absolute; transform-origin: 0 0; transition-delay: 2450ms; width: 109px; height: 38px; background: hsl(0, 0%, 88%); bottom: 0; right: 0;}/*补全 折叠尾翼 剩余 三角区域*/.left-bottom.fold:after { position: absolute; content: ""; border-right: 92px solid hsla(0, 0%, 0%, 0); border-bottom: 39px solid hsl(0, 0%, 88%); border-top: 37px solid hsla(0, 0%, 0%, 0); left: 109px; bottom: 0;}.right-bottom.fold:after { position: absolute; content: ""; border-left: 92px solid hsla(0, 0%, 0%, 0); border-bottom: 39px solid hsl(0, 0%, 88%); border-top: 37px solid hsla(0, 0%, 0%, 0); left: -92px; bottom: 0;}/****************************//****此处开始配合js*****//*折叠效果*/.fold { transition: transform 800ms ease-out; backface-visibility: hidden; position: absolute; background-color: transparent; z-index: 0; width: 0;}/* 折叠效果（左机翼、左尾翼） */.left-top.fold.curved { transform: rotate3d(1,-1.11,0,180deg);}.left-bottom.fold.curved { transform: rotate3d(2.4867,1,0,-180deg);}/* 折叠效果（右机翼、右尾翼）*/.right-top.fold.curved { transform: rotate3d(1,1.11,0,180deg);}.right-bottom.fold.curved { transform: rotate3d(-2.4867,1,0,180deg);}/* 平放一整个飞机 */.airplane.hover { transform: rotateX(54deg) rotateY(-10deg) rotateZ(25deg); transition-delay: 0.5s;}/*放平之后 左侧整体倾斜 （体现折叠效果）*/.backup-end.hover .left-plane { transform: rotateY(60deg);}.backup-end.hover .right-plane { transform: rotateY(-60deg);}/* 3d视觉中放平 左侧机翼*/.backup-end.hover .wing1 { transform: translateY(-38px) translateX(8px) rotateZ(22.62deg) rotateY(-60deg) skewY(-22.62deg); border-right: 100px solid hsl(0, 0%, 95%);}/*左侧 飞机手持部位透明度降低*/.backup-end.hover .wing2 { border-left: 100px solid hsl(0, 0%, 85%);}/* 3d视觉中放平 右侧机翼*/.backup-end.hover .wing4 { transform: translateY(-38px) translateX(-8px) rotateZ(-22.62deg) rotateY(60deg) skewY(20deg); border-left: 100px solid hsl(0, 0%, 95%);}/*右侧 飞机手持部位透明度降低*/.backup-end.hover .wing3 { border-right: 100px solid hsl(0, 0%, 71%);}/*机翼 折叠效果（右机翼、右尾翼） 之后 多余部分隐藏掉*/.backup-end.hover .curved { display: none;}/* #wind_container.hover .wing { backface-visibility: visible;} *//* 飞机后退助跑 */.backup-end.hover.fly_away_first { transform: translateX(-100px) translateZ(300px) rotateX(42deg) rotateY(-11deg) rotateZ(27deg); transition-delay: 0ms; transition-duration: 0.4s; transition-timing-function: ease-out;}/* 飞机向前飞翔至消失 */.backup-end.hover.fly_away_first.fly_away { transform: translateX(600px) translateY(-400px) translateZ(-5000px) rotateX(66deg) rotateY(-12deg) rotateZ(36deg); transition: transform 2s ease-out, opacity 1.5s 0.5s linear; opacity: 0;}

js:

// 童年的纸飞机const fly = document.getElementsByClassName('fly')[0];const front = document.getElementsByClassName('front-end')[0];const backup = document.getElementsByClassName('backup-end')[0];const fold = document.getElementsByClassName('fold');fly.addEventListener('click', () => { first().then(second).then(third).then(fourth).then(fifth).catch((err)=> { console.log(err) });}, false);// 第一步function first() { return new Promise((suc, err) => { setTimeout(() => { // 隐藏信息面板 front.classList.remove('show-front'); // 翻转至正面 backup.classList.remove('show-backup'); // 折叠效果（左翼、右翼） for (let i = 0; i < fold.length; i++) { fold[i].classList.add('curved') } // 颜色变换 document.body.style.backgroundColor = "#54575A"; suc(1) }, 200) })}function second() { return new Promise((suc, err) => { setTimeout(function () { backup.classList.add('hover'); document.body.style.backgroundColor = "#AD8BD8"; suc(2) }, 2800); })}//步骤三：飞机后退助跑function third() { return new Promise((suc, err) => { setTimeout(function () { backup.classList.add('fly_away_first'); document.body.style.backgroundColor = "#6E99C4"; suc(3) }, 2000); })}// 步骤四：飞机向前飞翔至消失function fourth() { return new Promise((suc, err) => { setTimeout(function () { backup.classList.add('fly_away'); document.body.style.backgroundColor = "#3F9BFF"; suc(4) }, 600); })}function fifth() { return new Promise((suc, err) => { setTimeout(function () { front.classList.add('show-front'); backup.classList.remove('fly_away','fly_away_first','hover'); backup.classList.add('show-backup'); for (let i = 0; i < fold.length; i++) { fold[i].classList.remove('curved') } document.body.style.backgroundColor = "#000"; suc(5) }, 3000); })}

参考自：腾讯课堂渡一教育，有兴趣的同学可以去听一听他们的课，讲的蛮不错的， 对初学者很友好。