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[英]With webpack, can I put Node.js and browser code in the same file, but prevent the Node.js code making it to the browser?
[英]Making node.js code work in browser
我對Node.js相當陌生,並正在創建一個普通的聊天應用程序以了解更多信息。 我正在使用ws庫
在我的實驗中,我發現node.js代碼不能直接在瀏覽器中運行(我更具體地要求()。) 因此,要使其在瀏覽器中工作,我必須使用browserify將代碼轉換為與瀏覽器兼容。
但是,轉換后的代碼將引發未定義函數的錯誤
我的node.js代碼
var WebSocket = require('ws')
, ws = new WebSocket('ws://localhost:8080');
ws.on('open', function() {
var firstMessage = '{"type":"name","message":"god"}';
ws.send(firstMessage.toString());
});
ws.on('message', function(message) {
console.log('received: %s', message);
});
我使用browserify轉換的代碼
(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/**
* Module dependencies.
*/
var global = (function() { return this; })();
/**
* WebSocket constructor.
*/
var WebSocket = global.WebSocket || global.MozWebSocket;
/**
* Module exports.
*/
module.exports = WebSocket ? ws : null;
/**
* WebSocket constructor.
*
* The third `opts` options object gets ignored in web browsers, since it's
* non-standard, and throws a TypeError if passed to the constructor.
* See: https://github.com/einaros/ws/issues/227
*
* @param {String} uri
* @param {Array} protocols (optional)
* @param {Object) opts (optional)
* @api public
*/
function ws(uri, protocols, opts) {
var instance;
if (protocols) {
instance = new WebSocket(uri, protocols);
} else {
instance = new WebSocket(uri);
}
return instance;
}
if (WebSocket) ws.prototype = WebSocket.prototype;
},{}],2:[function(require,module,exports){
var WebSocket = require('ws')
, ws = new WebSocket('ws://localhost:8080');
console.log(ws);
ws.on('open', function() { //line that contains error
var firstMessage = '{"type":"name","message":"Ayush"}';
ws.send(firstMessage.toString());
});
ws.on('message', function(message) {
console.log('received: %s', message);
});
},{"ws":1}]},{},[2]);
我的服務器代碼
var WebSocketServer = require('ws').Server
, wss = new WebSocketServer({port: 8080});
var index = 0;
var map = {};
wss.on('connection', function(ws) {
map[index] = ws;
var myindex = index;
var username;
index++;
ws.on('message', function(message) {
var json = JSON.parse(message);
if(json.type == "name"){
username = json.message;
console.log(username);
} else {
//Print Message
}
});
ws.send('something');
ws.on('close', function(){
console.log("Deleting index" + myindex);
delete map[myindex];
});
});
但是,當我使用browserify並使用轉換后的代碼時,它將在第50行引發錯誤。
Uncaught TypeError:undefined不是 ws.open上的函數
ws
庫建立在原始TCP套接字之上。 出於安全原因,您不能在客戶端JavaScript中使用它們,因此將無法正常工作。 您需要在瀏覽器中使用WebSocket
構造函數。
唯一可以成功瀏覽的node.js庫是那些不使用node.js標准庫的庫-文件系統,網絡等。即,實用工具庫,例如underscore
和async
。
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