Promise.allSettled 实现原理

Promise.allSettled = function (list) {
    if (list instanceof Array) {
        let ret = [];
        list.forEach((i) => {
            ret.push(
                new Promise(function (resolve, reject) {
                    i.then((v) => {
                        resolve({ state: true, data: v });
                    }).catch((e) => {
                        resolve({ state: false, data: e });
                    });
                })
            );
        });
        return Promise.all(ret);
    }
    return Promise.reject();
};

// 简单测试

function rand() {
    return new Promise(function (resolve, reject) {
        let ret = parseInt(Math.random() * 100);
        console.log(ret, ret % 1)
        if (ret%2 === 0) {
            resolve(ret);
        } else {
            reject(ret);
        }
    });
}



// test

let list = [];
for (let i = 10; i > 0; i--) {
    list.push(rand());
}
Promise.allSettled(list).then(v => console.log(v))