javascript - 如何加入socket聊天室

Question

在this guide的帮助下，我正在尝试建立一个套接字聊天。快完成了，但是用户无法加入其他房间。下面的代码是我的“加入房间功能”:

    client.on("joinRoom", function(id) {  
var room = rooms[id];
if (client.id === room.owner) {
  client.emit("update", "You are the owner of this room and you have already been joined.");
} else {
  room.people.contains(client.id, function(found) {
      if (found) {
          client.emit("update", "You have already joined this room.");
      } else {
        if (people[client.id].inroom !== null) { //make sure that one person joins one room at a time
            console.log("User is already in a room");
          client.emit("update", "You are already in a room ("+rooms[people[client.id].inroom].name+"), please leave it first to join another room.");
        } else {
      room.addPerson(client.id);
      people[client.id].inroom = id;
      client.room = room.name;
      client.join(client.room); //add person to the room
      user = people[client.id];
      socket.sockets.in(client.room).emit("update", user.name + " has connected to " + room.name + " room.");
      client.emit("update", "Welcome to " + room.name + ".");
      client.emit("sendRoomID", {id: id});
    }
      }
  });
}
});

当用户尝试加入某人的房间时，该功能会在“更新”处停止，通知用户已经在房间中。这是为什么？

Answer 1

问题是!==。

改变

if (people[client.id].inroom !== null) {

至

if (people[client.id].inroom != null) {

undefined !== null 给你的是 true，但你本质上希望 undefined 表现得好像它等同于 null。 !== 实际上会将它们视为单独的，而 != 会将它们视为等效的，这就是您想要的。