javascript - 从nodejs中的redis返回hgetall列表

Question

我正在尝试返回一个 json 对象，以便我可以在呈现页面以填充列表之前将其传回。我的问题是我不知道如何从 hgetall 回调函数中传递对象数据。这是我的示例，其中包含对我所缺少的内容的评论:

var redis = require("redis"),
    client = redis.createClient();

function createMobs() {

    var mobObject = {
        name: "Globlin",
        hp: 12,
        level: 1
    };
    client.hmset("monsterlist", "mobs", JSON.stringify(mobObject));

    var myMobs = function(object) {
        return object;
    };

    var getMobs = function(callback) {   
      client.hgetall("monsterlist", function(err, object) {
        callback(object);
      });    
    };

    // This is returning undefined instead of my mob
    console.log("mobs: ", getMobs(myMobs));

    // Goal is to return moblist
    // return getMobs(myMobs);

}

exports.createMobs = createMobs;

Answer 1

简短的回答是您没有异步思考。因为您在函数中使用异步函数，所以您的函数也必须是异步的。

由于您没有发布其余代码，所以基本思路如下:

var client = require('redis').createClient();

function createMobs(callback) {
    var mobObject = { name: 'Goblin' };

    client.hmset('monsterlist', 'mobs', JSON.stringify(mobObject), function(err) {
        // Now that we're in here, assuming no error, the set has went through.

        client.hgetall('monsterlist', function(err, object) {
            // We've got our object!

            callback(object);
        });

        // There is no way to run code right here and have it access the object variable, as it would run right away, and redis hasn't had time to send you the data yet. Your myMobs function wouldn't work either, because it is returning a totally different function.
    });
};

app.get('/create', function(req, res) {
    createMobs(function(object) {
        res.render('mobs.jade', {
            mobs: object
        });
    });
});

希望这有助于解决问题。