Question

我使用npm async waterfall方法编写功能。在那里我发现了一个奇怪的情况（可能是，我的意识很低）。我的功能如下。我在第一个函数中创建了一个事件数组，并通过回调参数将它传递给第二个函数。然后我在第二个函数中捕获该数组并循环它。我想操纵数组的几个值。之后我将它发送到最终功能。

最终函数中的console.log语句只输出第一个函数的数组初始状态，而不是我在第二个函数中完成的操作。任何想法都非常感谢。

var _async = require('async');
var criteria =  {};

_async.waterfall([
    function getSortedCalenderItems(callback){
        var events = []; // set of events are included inthis array
        callback(null, events)
    },

    function getUsers(events, callback) {  
            for (var i = 0; i < events.length; i++) {
                var event = events[i];
                var user = event.shared_user;

                // manipulate user
                var newUser = {
                    'id' : '<id>',
                    'name' : 'New name'
                };

                event.shared_user = newUser;
                events[i-1] = event;

                if(i === (events.length)) {
                    callback(null, events)
                }
            }

    }
],function(err, events){
        console.log(events); // this shows the initial state of the array. Not the manipulated events array.
        return;
});

Answer 1

例如;

var _async = require('async');
var criteria = {};

_async.waterfall([
    function (callback) {
        var events = [// set of events are included inthis array
            {
                name: "event1",
                shared_user : "halil"
            }, {
                name: "event1",
                shared_user : "halil"
            }
        ];
        callback(null, events);
    },
    function (events, callback) {
        console.log(events)
        for (var i = 0; i < events.length; i++) {
            var event = events[i];
            var user = event.shared_user;

            // manipulate user
            user = {
                'id': '<id>',
                'name': 'New name'
            };

            if (i === (events.length - 1)) {
                callback({}, events)
            }
        }
    }
], function (err, events) {
    console.log(err, events);
});

NodeJs瀑布回调功能不起作用

1 个答案: