node.js - 关于nodejs的async.parallel并行执行多个任务

Question

在使用async.parallel项目的过程中发现了个问题。例如，我同时异步执行100个任务，在这些任务都结束后，再对所有结果进行操作。现在的问题是，如果按下面这种写法，那我是要写100个雷同的方法了，我想是不是可以用个for循环来让这些方法同时运行呢？但是我试过会报错，各位大神能支个招吗？

var async = require('async');
function test() {
    async.parallel([
        function (callback) {
            setTimeout(function () {
                callback(null, 1);
            }, 100);
        },
        function (callback) {
            setTimeout(function () {
                callback(null, 2);
            }, 100);
        },
        function (callback) {
            setTimeout(function () {
                callback(null, 3);
            }, 100);
        },
        // 如果这后面面还有一样的97个方法......
    ], function (err, results) {
        var rlt = results[0] + '|' + results[1] + '|' + results[2] + ......;
        console.log(rlt)
    });
}

test();

Answer 1

Made it myself

function test() {
    var arr = [];
    for (var i = 0; i < 100; i++) {
        arr[i] = function (num) {
            return function (callback) {
                callback(null, num);
            }
        } (i)
    }
    return arr;
}

var arr = test();

async.parallel(arr, function (err, results) {
    console.log(results);
});

Answer 2

First construct an array in the outer for loop, consisting of one hundred functions, and then pass it in.

Answer 3

Promise.coroutine(function *() {  
    const results = yield Promise.all([
        Promise.resolve(1),
        Promise.resolve(2)
    ])

    console.log('array', results[0], results[1])

    const [a, b] = yield Promise.all([
        Promise.resolve(1),
        Promise.resolve(2)
    ])

    console.log('destructured', a, b)
})()

Reference documentation

In-depth understanding of javascript asynchronous mode
bluebirdjs