Question

鉴于以下node.js模块，我如何调用数组orderedListOfFunctions中的函数传递每个response变量？

var async = require("async");
var one = require("./one.js");
var two = require("./two.js");

module.exports = function (options) {

var orderedListOfFunctions = [
    one,
    two
];

return function (request, response, next) {

    // This is where I'm a bit confused...
    async.series(orderedListOfFunctions, function (error, returns) {
        console.log(returns);
        next();
    });

};

Answer 1

您可以使用bind执行此操作：

module.exports = function (options) {
  return function (request, response, next) {
    var orderedListOfFunctions = [
      one.bind(this, response),
      two.bind(this, response)
    ];

    async.series(orderedListOfFunctions, function (error, resultsArray) {
      console.log(resultArray);
      next();
    });
};

bind调用会在response调用one和two函数前提供的参数列表前加上async.series。

请注意，我还在回调中移动了结果和next()处理，因为这可能是你想要的。

Answer 2

符合OP的要求，而不关闭返回函数中的orderredListOfFunctions：

var async = require("async");
var one = require("./one.js");
var two = require("./two.js");

module.exports = function (options) {

  var orderedListOfFunctions = function (response) {return [
      one.bind(this, response),
      two.bind(this, response)
   ];};

   return function (request, response, next) {
      async.series(orderedListOfFunctions(response), function (error, returns) {
         console.log(returns);
         next();
      });
   };
};

Answer 3

简单的替代方案是 applyEachSeries -

applyEachSeries(tasks, args..., [callback])

示例 -

function one(arg1, arg2, callback) {
    // Do something
    return callback();
}

function two(arg1, arg2, callback) {
    // Do something
    return callback();
}

async.applyEachSeries([one, two], 'argument 1', 'argument 2', function finalCallback(err) {
    // This will run after one and two
});

如何将一组标准参数传递给async.js系列中的每个函数？

3 个答案: