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JavaScriptでロード画面を作る

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JavaScript勉強中、「文字にアニメーションをつける」解説動画を見つけたので、ロード画面として作ってみました。

##Demoページ
https://kngy0306.github.io/Loading/

##コード
###html

<body>
    <!-- ロード画面 -->
    <div class="init">
        <h1 class="loading">Now Loading...</h1>
    </div>
    <!-- ロード後の画面 -->
    <div class="main">
    <h1>メイン画面</h1>
  </div>
</body>

###css

*{
    padding: 0;
    margin: 0;
}

.init{
    background: black;
    width: 100%;
    height: 100vh;
    position: fixed;
}

.init h1{
    color: #ecf0f1;
    text-align: center;
    line-height: 100vh;
    font-size: 3em;
}

span{
    transition: all .3s;
}

.coloring{
    color: #812990;
}

.fadeout {
    animation : fadeOut 2s;
  }
  @keyframes fadeOut {
    0% {
      opacity: 1;
    }
    100% {
      opacity: 0;
    }
  }

###javascript

// ロード中、表示する文字一つ一つに<span>をつける
const text = document.querySelector('.loading');
const strText = text.textContent;
const splitText = strText.split("");
text.textContent = '';

for(let i=0; i < splitText.length; i++){
    text.innerHTML += "<span>" + splitText[i] + "</span>";
}

// 160ミリ秒ごとspanにcoloringクラスを加える
let char = 0;
let timer = setInterval(setFade, 160);

function setFade(){
    const span = text.querySelectorAll('span')[char];
    span.classList.add('coloring');
    char++;
    // 最後の文字に到達したら二つの関数を呼び出す
    if(char === splitText.length){
        finish();
        fadeOut();
    }
}

function finish(){
    clearInterval(timer);
    timer = null;
}

// ロード画面を作るdivにfadeoutクラスを加える
function fadeOut(){
    const init = document.querySelector('.init');
    init.classList.add('fadeout');
    // 2秒後にdisplay: none;を加える
    setTimeout(function(){
        init.style.display = 'none';
    }, 2000);
}
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