关于html:第-52-题如何使用一个-promise以及-Promiseall

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let request = new Promise((resolve, reject) => {
    // 表达式
    if (true) {resolve({ age: 20});
    } else {reject('申请接口失败');
    }
});

request
    .then(res => {console.log('res', res); // {age: 20}
    })
    .catch(res => {console.log('res2', res); // 申请接口失败
    });

let requestA = new Promise(resolve => {setTimeout(() => {resolve({ requestA: 20});
    }, 1000 * 2);
});

let requestB = new Promise(resolve => {resolve({ requestB: 50});
});

let requestAll = Promise.all([requestA, requestB]).then(res => {console.log('res', res); // [{requestA: 20}, {requestB: 50}]
});