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HTML

              
                <h1>Promise</h1>
<button onclick="startTasks()">処理を開始</button>
<div id="output"></div>
              
            
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CSS

              
                
              
            
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JS

              
                // ボタンを押したら開始する処理
function startTasks() {

    updateOutput("処理命令開始");

    // task1を実行して、Promiseが解決されるのを待ちます。
    task1().then(() => {
        // task1が完了したら、task2を実行します。
        // task2もPromiseを返すので、これが解決されるのを待ちます。
        return task2();
    }).then(() => {
        // task2の完了後、最終的に「処理命令終了」を表示します。
        updateOutput("処理命令終了");
    });
}

// 500ミリ秒遅延する処理
function task1() {
    return new Promise(resolve => {
        setTimeout(() => {
            updateOutput("タスク1完了");
            resolve();
        }, 500);
    });
}

// 100ミリ遅延する処理
function task2() {
    return new Promise(resolve => {
        setTimeout(() => {
            updateOutput("タスク2完了");
            resolve();
        }, 100);
    });
}

function updateOutput(message) {
    const output = document.getElementById('output');
    output.innerHTML += '<p>' + message + '</p>';
}
              
            
!
999px

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