マンガでわかるJavaScriptのPromise

const timer = (time, type) => {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            if (type === 'resolve') {
                resolve(`${time} 解決`);
            }
            if (type === 'reject') {
                reject(`${time} 拒否`);
            }
        }, time);
    });
};

(async function() {
    try {
        const res1 = await timer(500, 'resolve');
        console.log(res1);

        const res2 = await timer(600, 'reject');
        console.log(res2);

        const res3 = await timer(700, 'resolve');
        console.log(res3);
    } catch(e) {
        console.log(e);
    }
    console.log('終了');
})();

    

500 解決
600 拒否
終了