<!--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>

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;
}

// 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);})
}