CSS3 realizes the childhood paper airplane

<!--Paper airplanes of childhood-->
<div class="airplane">
    <div class="front-end show-front">
        <!--Text box with adaptive width and height-->
        <div class="text-input" contenteditable = true></div>
        <div class="fly">
            fly
        </div>
    </div>
    <div class="backup-end show-backup">
        <div class="left-plane">
            <!--Folding area in the upper left corner-->
            <div class="left-top fold"></div>
            <!--Folding area in the lower left corner-->
            <div class="left-bottom fold"></div>
            <!--Body-->
            <div class="wing wing1"></div>
            <div class="wing wing2"></div>
        </div>
        <div class="right-plane">
            <!--Folding area in the upper right corner-->
            <div class="right-top fold"></div>
            <!--Folding area in the lower right corner-->
            <div class="right-bottom fold"></div>
            <!--Body-->
            <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;
}
/*Depth of field added to parent*/
.airplane{
    width: 100%;
    height: 100%;
    -webkit-perspective: 800px;
    -webkit-perspective-origin: 50% 50%;
}
/*Paper airplane front*/
/*Do not rotate at the beginning*/
.front-end.show-front{
    transform: rotateY(0deg);
}
/*Click to rotate*/
.front-end{
    background: rgba(255, 255, 255, 0.15);
    *background: hsl(0, 0%, 88%);
    /*Rotate -180 degrees around the Y axis*/
    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;
}
/*Text box*/
.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 is hue/saturation/brightness/*/
    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;
}
/*Shrink animation when clicking the button*/
.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;
}
/*Don't show the plane at first*/
.backup-end.show-backup{
    transform: rotateY(180deg);
}
/*Common styles for the left and right sides of the aircraft*/
.left-plane, .right-plane{
    transform-style: preserve-3d;
    width: 200px;
    height: 260px;
    display: block;
    position: absolute;
    top: 0px;
    transition: all 1s ease-in-out;
}
/*left*/
.left-plane{
    transform: rotateZ(0deg);
    transform-origin: 100% 50% 0;
    left: 0;
}
/*right*/
.right-plane{
    transform: rotateZ(0deg);
    transform-origin: 0% 50%;
    left: 199px;
}
/*Common style for left and right fuselage*/
.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;
}
/*Draw the prototype of the 2D aircraft*/
.wing1 {
    transform-origin: 100% 100%;
    transform: translateY(-38px) translateX(8px) rotateZ(22.62deg) skewY(-22.62deg);/*Offset rotation of 2D image*/
}

.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;
}
/*Draw the foldable area*/
.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;
}
/*Complete the remaining triangle area of ​​the folding tail*/
.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;
}

/********************************/
/****Start to cooperate with js***** here/
/*Folding effect*/
.fold {
    transition: transform 800ms ease-out;
    backface-visibility: hidden;
    position: absolute;
    background-color: transparent;
    z-index: 0;
    width: 0;
}
/* Folding effect (left wing, left tail) */
.left-top.fold.curved {
    transform: rotate3d(1,-1.11,0,180deg);
}

.left-bottom.fold.curved {
    transform: rotate3d(2.4867,1,0,-180deg);
}
/* Folding effect (right wing, right tail) */
.right-top.fold.curved {
    transform: rotate3d(1,1.11,0,180deg);
}

.right-bottom.fold.curved {
    transform: rotate3d(-2.4867,1,0,180deg);
}

/* Lay the entire plane flat*/
.airplane.hover {
    transform: rotateX(54deg) rotateY(-10deg) rotateZ(25deg);
    transition-delay: 0.5s;
}
/*After laying flat, the left side is tilted as a whole (reflecting the folding effect)*/
.backup-end.hover .left-plane {
    transform: rotateY(60deg);
}

.backup-end.hover .right-plane {
    transform: rotateY(-60deg);
}
/* Level the left wing in 3D vision */
.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%);
}
/*The transparency of the left aircraft handheld part is reduced*/
.backup-end.hover .wing2 {
    border-left: 100px solid hsl(0, 0%, 85%);
}

/* Level the right wing in 3D vision */
.backup-end.hover .wing4 {
    transform: translateY(-38px) translateX(-8px) rotateZ(-22.62deg) rotateY(60deg) skewY(20deg);
    border-left: 100px solid hsl(0, 0%, 95%);
}

/*The transparency of the right handheld part of the aircraft is reduced*/
.backup-end.hover .wing3 {
    border-right: 100px solid hsl(0, 0%, 71%);
}

/*Wing folding effect (right wing, right tail) and then the excess parts are hidden*/
.backup-end.hover .curved {
    display: none;
}

/* #wind_container.hover .wing {
    backface-visibility: visible;
} */


/* Plane moves backwards*/
.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;
}
/* The plane flies forward until it disappears*/
.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;
}

// Childhood paper airplane 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);
// First step function first() {
    return new Promise((suc, err) => {
        setTimeout(() => {
            // Hide the information panel front.classList.remove('show-front');
            // Flip to the front backup.classList.remove('show-backup');
            // Folding effect (left wing, right wing)
            for (let i = 0; i < fold.length; i++) {
                fold[i].classList.add('curved')
            }
            // Color transformation 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);
    })
}
//Step 3: The plane moves backwards to start running function third() {
    return new Promise((suc, err) => {
        setTimeout(function () {
            backup.classList.add('fly_away_first');
            document.body.style.backgroundColor = "#6E99C4";
            suc(3)
        }, 2000);
    })
}
// Step 4: The plane flies forward until it disappears 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);
    })
}