有没有用过 Promise.allSettled() ，它是干什么的
Issue 欢迎在 Gtihub Issue 中回答此问题: Issue 247
Author 回答者: mrrs878
接收一个可迭代对象，其中每个成员都是Promise。在所有给定的Promise都已经fulfilled或rejected后返回一个Promise，并带有一个对象数组，每个对象表示对应的Promise结果
相较于Promise.all，后者会在任何一个Promise为rejected时立即结束
简单实现
const myPromiseSettled = (items) => {
const onResolved = (value) => ({ status: "fulfilled", value });
const onRejected = (reason) => ({ status: "rejected", reason });
return Promise.all(
items.map((item) => Promise.resolve(item).then(onResolved, onRejected)),
);
};Author 回答者: shfshanyue
@mrrs878 代码相当简洁了！
Author 回答者: justorez
function allSettled(promises = []) {
return new Promise((resolve) => {
let count = 0;
let values = new Array(promises.length);
const collect = (index, status) => (value) => {
const prop = status === "fulfilled" ? "value" : "reason";
values[index] = { status, [prop]: value };
++count === promises.length && resolve(values);
};
promises.forEach((promise, i) => {
if (isPromise(promise)) {
promise.then(collect(i, "fulfilled"), collect(i, "rejected"));
} else {
collect(i, "fulfilled")(promise);
}
});
});
}