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HTML

              
                <h1>async/await</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
async function startTasks() {
    // 処理の開始を示すメッセージを出力
    updateOutput("処理命令開始");
    
    // task1の完了を待つ
    await task1();
    
    // task1の完了後にtask2の完了を待つ
    await task2();
    
    // すべてのタスクが完了したことを示すメッセージを出力
    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(); // Promiseを解決してtask1の終了を示す
        }, 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(); // Promiseを解決してtask2の終了を示す
        }, 100);
    });
}

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

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