有趣的交互系列 - 文字遮罩入场效果

摘要：在这个系列里分享一些简单，但是很有意思的交互效果附上地址和地址滚动，添加对应加载的比如巧用实现文字和遮罩层的动画效果文字动画遮罩层动画首先然后把且，这样就实现了遮罩层的进场和退出效果随机获取数组项

在这个系列里分享一些简单，但是很有意思的交互效果~
附上demo地址和github地址

滚动，添加对应加载的class(比如loaded)

巧用animation实现文字和遮罩层的动画效果

文字动画: opacity 0 -> 1;

遮罩层动画: 首先width 0 -> 100%,然后把width 100% -> 0且left 0 -> 100%，这样就实现了遮罩层的进场和退出效果;

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"));
}

// 随机获取数组项
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);