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JavaScript　ClickイベントとFunction（関数）

Posted at 2020-12-29

#目標

JavaScriptでClickイベントを作る

#HTMLファイル

index.html

    <!DOCTYPE html>
    <html lang="ja">

    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>DOM</title>
        <style>
            .red {
                background: red;
                color: white;
                text-transform: uppercase;
                font-size: 2rem;
            }

            .blue {
                backgroun:white_check_mark:d: blue;
                color: white;
                text-transform: capitalize;
                letter-spacing: 10px;
            }

            .btn {
                background: #f15025;
                color: white;
                font-size: 1.2rem;
                border: none;
            }
        </style>
    </head>

    <body>

        <h2>events in javascript</h2>
        <button class="btn">click me</button>
        <!-- JavaScript -->
        <script src="main.js"></script>
    </body>

    </html>

#JavaScriptファイル

ボタンをクリックすると表示が切り替わります！

app.js

// Step1: select element
// Step2: addEventListener()
// Step3: what event, what todo

const btn = document.querySelector('.btn');
const heading = document.querySelector('h2');

function changeColors() {
    let hasClass = heading.classList.contains('red');
    console.log(hasClass);
    if (hasClass) {
        heading.classList.remove('red');
    } else {
        heading.classList.add('blue');
    }
}

btn.addEventListener('click', changeColors);

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JavaScript ClickイベントとFunction（関数）

JavaScript　ClickイベントとFunction（関数）