摘要：在這個系列里分享一些簡單，但是很有意思的交互效果附上地址和地址滾動，添加對應加載的比如巧用實現文字和遮罩層的動畫效果文字動畫遮罩層動畫首先然后把且，這樣就實現了遮罩層的進場和退出效果隨機獲取數組項

在這個系列里分享一些簡單，但是很有意思的交互效果~
附上demo地址和github地址

滾動，添加對應加載的class(比如loaded)

巧用animation實現文字和遮罩層的動畫效果

文字動畫: opacity 0 -> 1;

遮罩層動畫: 首先width 0 -> 100%,然后把width 100% -> 0且left 0 -> 100%，這樣就實現了遮罩層的進場和退出效果;

html:

    

        

            
SANDWICHES & PANCAKE
            
GARDEN
            
MORNING & TOMORROW & FRIEND
            

                ORANGE & BIRD & SHEEP & CUP & BUS
            
APPLE & FRUIT & CAR
            
CAKE & PICTURE & CAT & STAMP
            

                PLANE & BOOK & RACKET & GLASS & BED
        
        

            
APPLE
BANANA & PINE APPLE & SHEEP
            
BANANA & PINE APPLE
        
        

            
PUMPKIN & TARO & CARROT
        
        

            
HORSERADISH & LETTUCE
            
PUMPKIN & TARO & CARROT
            
HORSERADISH & LETTUCE
            
POTATO & BURDOCK
        
        

            

                EGG & BAG & ROSE & CHAIR & BAT
            

                FISH & NOTEBOOK & PENCIL & DOG & DESK
            
WATCH & MITT & MILK & FLOWER
            
DOOR & BOAT & PIANO & 
        
        

            
POTATO & BURDOCK
            
APPLE
BANANA & PINE APPLE
            
LETTER
CAP & TAPE & MAIL & BOX
        
        

            
APPLE
BANANA & PINE APPLE
            
TURNIP & OKRA & PEA
        
        

            
SHIITAKE & BEEFSTEAK PLANT
        
    

css:

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: #000;
}

main {
    padding: 10vw 0;
}

ul {
    width: 100%;
    max-width: 70%;
    margin: 0 auto;
}

li {
    margin: 10vw 0;
    text-align: left;
}

p {
    display: block;
    color: #fff;
    font-family: "Lato", sans-serif;
    font-size: 2vw;
    font-weight: 900;
    line-height: 1.2;
}

p+p {
    margin-top: 10px;
}

li:first-child {
    margin-top: 0;
}

li:last-child {
    margin-bottom: 0;
}

li:nth-child(even) {
    text-align: right;
}

a {
    color: #fff;
}

a:hover {
    text-decoration: none;
}

[data-reveal="content"] {
    display: inline-block;
    position: relative;
}

[data-reveal="cover"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    z-index: 1;
}

[data-reveal="text"] {
    opacity: 0;
}

@keyframes reveal-cover {
    0% {
        width: 0;
        left: 0;
    }

    44% {
        width: 100%;
        left: 0;
    }

    54% {
        width: 100%;
        left: 0;
    }

    100% {
        width: 0;
        left: 100%;
    }
}

@keyframes reveal-text {
    0% {
        opacity: 0;
    }

    44% {
        opacity: 0;
    }

    54% {
        opacity: 1;
    }
}

[data-js="reveal"].loaded [data-reveal="cover"] {
    animation: reveal-cover 1.5s ease-in-out;
}

[data-js="reveal"].loaded [data-reveal="text"] {
    opacity: 1;
    animation: reveal-text 1.5s ease-in-out;
}

javascript:

const COLOR_LIST = ["#7f00ff", "#ff00ff", "#0000ff", "#007fff", "#00ffff"];
let $targetList;

const init = () => {

    $targetList = document.querySelectorAll("[data-js="reveal"]");

    setup();

    window.addEventListener("scroll", onScroll, false);
    window.dispatchEvent(new Event("scroll"));
}

// 隨機獲取數組項
const getArrayRandomValue = (array) => array[Math.floor(Math.random() * array.length)];

const setup = () => {
    for (const $target of $targetList) {
        const content = $target.innerHTML;
        const color = "revealColor" in $target.dataset ? $target.dataset.revealColor : getArrayRandomValue(COLOR_LIST);
        $target.innerHTML = `
${content}`;
    }
}

const onScroll = () => {
    const windowH = window.innerHeight;
    const scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
    const isMostScroll = document.body.clientHeight <= scrollTop + windowH;

    for (const $target of $targetList) {

        if ($target.classList.contains("loaded")) continue;

        const rect = $target.getBoundingClientRect();
        const top = rect.top + scrollTop;
        if (isMostScroll || top <= scrollTop + (windowH * .8)) $target.classList.add("loaded");

    }

}
document.addEventListener("DOMContentLoaded", init, false);