NodeJS 操作 Redis 发布订阅消息

首先先说一下流程：

1. 保存数据到 Redis，然后将 member 值 publish 到 chat 频道（publish.js 功能）
2. readRedis.js 文件此前一直在监听 chat 频道，readRedis.js 文件接收到 member 后，用它作为条件去 Redis 中去查找，拿到 score 数据

publish.js 文件：

var redis = require("redis");
var client = redis.createClient(6379, "127.0.0.1");

function zadd(key, score, member) {
    client.zadd(key, score, member, function () {
        client.publish("chat", member);//client将member发布到chat这个频道
        //然后订阅这个频道的订阅者就会收到消息
    });
}
for (var i = 0; i < 10; i++) {
    zadd("z", i, "" + i);//发布10次
    console.log("第" + i + "次");
}

readRedis.js 文件：

var client = redis.createClient(6379, "127.0.0.1");
var client1 = redis.createClient(6379, "127.0.0.1");

function getRedisData() {
    //客户端连接redis成功后执行回调
    client.on("ready", function () {
        //订阅消息
        client.subscribe("chat");
        client.subscribe("chat1");
        console.log("订阅成功。。。");
    });

    client.on("error", function (error) {
        console.log("Redis Error " + error);
    });

    //监听订阅成功事件
    client.on("subscribe", function (channel, count) {
        console.log("client subscribed to " + channel + "," + count + "total subscriptions");
    });

    //收到消息后执行回调，message是redis发布的消息
    client.on("message", function (channel, message) {
        console.log("我接收到信息了" + message);
        dealWithMsg(message);
    });

    //监听取消订阅事件
    client.on("unsubscribe", function (channel, count) {
        console.log("client unsubscribed from" + channel + ", " + count + " total subscriptions")
    });
}

function dealWithMsg(message) {
    //按照message查询内容
    client1.zscore("z", message, function (err, reply) {
        console.log(message + "的内容是：" + reply);
    });
}
getRedisData();

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