javascript 承诺所有运行所有承诺和处理程序错误

Posted 2021-05-03

var p1 = new Promise((resolve, reject) => { 
  setTimeout(resolve, 1000, 'one'); 
}); 
var p2 = new Promise((resolve, reject) => { 
  setTimeout(resolve, 2000, 'two'); 
});
var p3 = new Promise((resolve, reject) => {
  setTimeout(resolve, 3000, 'three');
});
var p4 = new Promise((resolve, reject) => {
  setTimeout(resolve, 4000, 'four');
});
var p5 = new Promise((resolve, reject) => {
  reject('reject');
});

var arrayDePromesas = [p1,p2,p5,p3,p4];
const reflect = (p,i) => p.then(
  v => {
    return {v, index: i, status: "fulfilled"}
    },
  e => {
    return {e, index: i, status: "rejected" }
    }
);
Promise.all(arrayDePromesas.map(reflect)).then(
  (results) => {
    var fulfilled = results.filter(x => x.status === "fulfilled");
    var rejected = results.filter(x => x.status === "rejected");
    console.log('rejected',rejected);
    console.log('fulfilled',fulfilled);
  });