类似的代码究竟
var WebSocketServer = require("ws").Server,
express = require("express"),
http = require("http"),
app = express(),
server = http.createServer(app);
var wss = new WebSocketServer({server: server});意味着什么？那到底是做什么的——为什么你需要给一个 websocket 服务器一个 http 服务器？