<!--童年的紙飛機--><div class="airplane">    <div class="front-end show-front">        <!--寬高自適應的文本框-->        <div class="text-input" contenteditable = true></div>        <div class="fly">            fly        </div>    </div>    <div class="backup-end show-backup">        <div class="left-plane">            <!--左上角折疊區域-->            <div class="left-top fold"></div>            <!--左下角折疊區域-->            <div class="left-bottom fold"></div>            <!--機身-->            <div class="wing wing1"></div>            <div class="wing wing2"></div>        </div>        <div class="right-plane">            <!--右上角折疊區域-->            <div class="right-top fold"></div>            <!--右下角折疊區域-->            <div class="right-bottom fold"></div>            <!--機身-->            <div class="wing wing3"></div>            <div class="wing wing4"></div>        </div>    </div></div>

body{    width: 100%;    height: 680px;    background-color: #000;    background-repeat: no-repeat;    overflow: hidden;    transition: all 2s linear;}/*景深加在父級上*/.airplane{    width: 100%;    height: 100%;    -webkit-perspective: 800px;    -webkit-perspective-origin: 50% 50%;}/*紙飛機前面*//*一開始不旋轉*/.front-end.show-front{    transform: rotateY(0deg);}/*點擊后旋轉*/.front-end{    background: rgba(255, 255, 255, 0.15);    *background: hsl(0, 0%, 88%);    /*繞Y軸旋轉-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是色調/飽和度/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;}/*點擊按鈕時縮小動畫*/.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;}/*一開始不顯示飛機*/.backup-end.show-backup{    transform: rotateY(180deg);}/*飛機的左右兩邊公共樣式*/.left-plane, .right-plane{    transform-style: preserve-3d;    width: 200px;    height: 260px;    display: block;    position: absolute;    top: 0px;    transition: all 1s ease-in-out;}/*左邊*/.left-plane{    transform: rotateZ(0deg);    transform-origin: 100% 50% 0;    left: 0;}/*右邊*/.right-plane{    transform: rotateZ(0deg);    transform-origin: 0% 50%;    left: 199px;}/*左右機身的公共樣式*/.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;}/*繪制  飛機2d 雛形*/.wing1 {    transform-origin: 100% 100%;    transform: translateY(-38px) translateX(8px) rotateZ(22.62deg) skewY(-22.62deg);/*2D圖像的偏移 旋轉*/}.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;}/*繪制可折疊區域*/.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;}/*補全 折疊尾翼 剩余 三角區域*/.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;}/****************************//****此處開始配合js*****//*折疊效果*/.fold {    transition: transform 800ms ease-out;    backface-visibility: hidden;    position: absolute;    background-color: transparent;    z-index: 0;    width: 0;}/* 折疊效果（左機翼、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);}/* 折疊效果（右機翼、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);}/* 平放一整個飛機 */.airplane.hover {    transform: rotateX(54deg) rotateY(-10deg) rotateZ(25deg);    transition-delay: 0.5s;}/*放平之后 左側整體傾斜 （體現折疊效果）*/.backup-end.hover .left-plane {    transform: rotateY(60deg);}.backup-end.hover .right-plane {    transform: rotateY(-60deg);}/* 3d視覺中放平 左側機翼*/.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%);}/*左側 飛機手持部位透明度降低*/.backup-end.hover .wing2 {    border-left: 100px solid hsl(0, 0%, 85%);}/* 3d視覺中放平 右側機翼*/.backup-end.hover .wing4 {    transform: translateY(-38px) translateX(-8px) rotateZ(-22.62deg) rotateY(60deg) skewY(20deg);    border-left: 100px solid hsl(0, 0%, 95%);}/*右側 飛機手持部位透明度降低*/.backup-end.hover .wing3 {    border-right: 100px solid hsl(0, 0%, 71%);}/*機翼 折疊效果（右機翼、右尾翼） 之后 多余部分隱藏掉*/.backup-end.hover .curved {    display: none;}/* #wind_container.hover .wing {    backface-visibility: visible;} *//* 飛機后退助跑 */.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;}/* 飛機向前飛翔至消失 */.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;}

// 童年的紙飛機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(() => {            // 隱藏信息面板            front.classList.remove('show-front');            // 翻轉至正面            backup.classList.remove('show-backup');            // 折疊效果（左翼、右翼）            for (let i = 0; i < fold.length; i++) {                fold[i].classList.add('curved')            }            // 顏色變換            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);    })}//步驟三：飛機后退助跑function third() {    return new Promise((suc, err) => {        setTimeout(function () {            backup.classList.add('fly_away_first');            document.body.style.backgroundColor = "#6E99C4";            suc(3)        }, 2000);    })}// 步驟四：飛機向前飛翔至消失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);    })}