Question

我正在node.js中制作一个非常简单的游戏。在我的TCP客户端中，我有一个异步函数，该函数返回一个Promise，当套接字收到信息后，Promise会解析，然后关闭。我的问题是：当我等待该函数时，程序会在解析以下示例之前继续运行：

async GetPlayers(player) {
    return new Promise(resolve =>{
        var net = require('net');
        const client  = new net.Socket();
    
        client.connect({
          port:this.port,
          host:this.IpAdress
        });
        
        client.on('error',function(error){
            console.log('Error : ' + error);
          });
          
        client.on('connect',function(){
        client.write("sendPlayersToMePls: "+ JSON.stringify(player)+"\n");
          var address = client.address();
          var port = address.port;
          var family = address.family;
          var ipaddr = address.address;
          
        });
        client.on('data',function(data){
            //
            var data2 = data.toString();
            if(data2.startsWith("hereAreYourPlayers: ")){
            if(Config.Verbose)console.log("data = "+data2);
            var players2 = data2.slice(20);
            var obj = JSON.parse(players2);
            that.FileSystem.allPlayers = obj.players;
            that.FileSystem.TickCount= parseInt(obj.turnCount);
            resolve(obj);
            client.end();
        }

    });
}

//to call it i am using the following
async UpdateMapStatuses(player){
        
        this.SetCurrentMap();
        const players = await GetPlayers(player);
        return new Promise(resolve => {
        //the program starts exectuing this before "players" has been defined
        //code that uses "players"
        }

}

Answer 1

尝试将client.on回调转换为箭头函数，看看是否有帮助。例如：

async GetPlayers(player) {
    return new Promise((resolve) =>{
        var net = require('net');
        const client  = new net.Socket();
    
        client.connect({
          port:this.port,
          host:this.IpAdress
        });
        
        client.on('error', (error) => {
            console.log('Error : ' + error);
          });
          
        client.on('connect', () => {
          client.write("sendPlayersToMePls: "+ JSON.stringify(player)+"\n");
          var address = client.address();
          var port = address.port;
          var family = address.family;
          var ipaddr = address.address;
          
        });
        client.on('data', (data) => {
            //
            var data2 = data.toString();
            if(data2.startsWith("hereAreYourPlayers: ")){
            if(Config.Verbose)console.log("data = "+data2);
            var players2 = data2.slice(20);
            var obj = JSON.parse(players2);
            that.FileSystem.allPlayers = obj.players;
            that.FileSystem.TickCount= parseInt(obj.turnCount);
            resolve(obj);
            client.end();
        }

期待的诺言，在等待之前不等待resolve（）

1 个答案: