Nodejs npm

時間 2019-11-09

標籤 nodejs npm 简体版

原文原文鏈接

安裝流程參考 http://www.cnblogs.com/seanlv/archive/2011/11/22/2258716.htmlhtml

<1>Node.js (https://nodejs.org/)node

　　安裝一路nextjquery

　　cmd node -v 顯示版本號即安裝成功git

<2>安裝npmgithub

　　https://github.com/npm/npm/tags 下載最新版本web

　　解壓至 D:/npmjsexpress

　　安裝npm過程, cmdnpm

D:\>cd npmjs
D:\npmjs>node cli.js install -gf

　　而後將" nodejs的路徑 /node_modules"加入系統環境變量"NODE_PATH"中json

<3>經過npm安裝Expressapp

　　cmd

npm install express -g //安裝最新版express

<4>socket.io (http://socket.io/get-started/chat/)

　　新建文件夾 chat-example, 裏面新建 manifest file package.json

//manifest file describes our project
{
  "name": "socket-chat-example",
  "version": "0.0.1",
  "description": "my first socket.io app",
  "dependencies": {}
}

　　in order to easily populate the dependencies with the things. cmd->

npm install --save express

npm install --save socket.io

　　具體代碼

//index.js
//Express initializes app to be a function handler that you can supply to an HTTP server
var app = require('express')();
var http = require('http').Server(app);

//a new instance of socket.io by passing the http (the HTTP server) object
var io = require('socket.io')(http);

//We define a route handler / that gets called when we hit our website home.
app.get('/', function(req, res){
    res.sendFile(__dirname + '/index.html');
});

//listen on the connection event for incoming sockets
io.on('connection', function(socket){
    socket.broadcast.emit('hi');
    socket.on('chat message', function(msg){
        //console.log('message: ' + msg);   
        io.emit('chat message', msg);  
    });
    socket.on('disconnect', function(){
        //console.log('user disconnected');
        io.emit('chat message', 'disconnected');
      });
});

//We make the http server listen on port 3000.
http.listen(3000, function(){
    console.log('listening on *: 3000');
});

//index.html
<!doctype html>
<html>
  <head>
    <title>Socket.IO chat</title>
    <style>
      * { margin: 0; padding: 0; box-sizing: border-box; }
      body { font: 13px Helvetica, Arial; }
      form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
      form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
      form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
      #messages { list-style-type: none; margin: 0; padding: 0; }
      #messages li { padding: 5px 10px; }
      #messages li:nth-child(odd) { background: #eee; }
    </style>
  </head>
  <body>
    <ul id="messages"></ul>
    <form action="">
      <input id="m" autocomplete="off"/><button>Send</button>
    </form>

    <!--That’s all it takes to load the socket.io-client, which exposes a io global, and then connect. -->
    <script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>
    <script src="http://code.jquery.com/jquery-1.11.1.js"></script>
    <script>
      var socket = io();
      //when the user types in a message, the server gets it as a chat message event.
      $('form').submit(function(){
        socket.emit('chat message', $('#m').val());
        $('#m').val('');
        return false;
      });

      socket.on('chat message', function(msg){
        $('#messages').append($('<li>').text(msg));
      });

    </script>

  </body>
</html>

<5>運行

　　cmd: cd->chat_example

　　node index.js

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