Node.js 之REST API

參考link
[url]http://www.runoob.com/nodejs/nodejs-restful-api.html[/url]

// http://www.runoob.com/nodejs/nodejs-restful-api.html// // --Coding Standard// 1 Enforce Callback Error Handling (handle-callback-err)// https://eslint.org/docs/rules/handle-callback-err.html//// 2 Disallow string concatenation when using __dirname and __filename (no-path-concat)// https://eslint.org/docs/rules/no-path-concat#disallow-string-concatenation-when-using-__dirname-and-__filename-no-path-concat// Include All variables// //var express = require('express')var app = express()var fs = require('fs')var moment = require('moment')var ROOT_PATH = __dirnamevar JSON_FILE = 'users.json'var FILE_ECODE_TYPE = 'utf8'var fullJsonFilePath = ROOT_PATH + '/' + JSON_FILE// Define All Basic Functions// ///function ListUserActionFunc (req, res) {  function GetFromJSONFunc (err, data) {    if (err) {      console.log(err.stack)    }    console.log('[%s]', moment().format('YYYY-MM-DD HH:mm:ss'))    console.log(data)    res.end(data)  }  fs.readFile(fullJsonFilePath, FILE_ECODE_TYPE, GetFromJSONFunc)}//// ///// 添加的新用户数据var addUser = {  'user4': {    'name': 'mohit',    'password': 'password4',    'profession': 'teacher',    'id': 4  }}function AddUserActionFunc (req, res) {  function GetFromJSONFunc (err, data) {    if (err) {      console.log(err.stack)    }    data = JSON.parse(data)    data['user4'] = addUser['user4']    console.log('[%s]', moment().format('YYYY-MM-DD HH:mm:ss'))    console.log(data)    res.end(JSON.stringify(data))  }  // 读取已存在的数据  fs.readFile(fullJsonFilePath, FILE_ECODE_TYPE, GetFromJSONFunc)}function DeleteUserFunc (req, res) {  console.log('hello DeleteUserFunc')  function GetFromJSONFunc (err, data) {    if (err) {      console.log(err.stack)    }    var id = 2    console.log('hello GetFromJSONFunc')    data = JSON.parse(data)    delete data['user' + id]    console.log('[%s]', moment().format('YYYY-MM-DD HH:mm:ss'))    console.log(data)    res.end(JSON.stringify(data))  }  // First read existing users.  fs.readFile(fullJsonFilePath, FILE_ECODE_TYPE, GetFromJSONFunc)}//// ///function GetIdFunc (req, res) {  function GetFromJSONFunc (err, data) {    if (err) {      console.log(err.stack)    }    data = JSON.parse(data)    var user = data['user' + req.params.id]    console.log('[%s]', moment().format('YYYY-MM-DD HH:mm:ss'))    console.log(user)    res.end(JSON.stringify(user))  }  // 首先我们读取已存在的用户  fs.readFile(fullJsonFilePath, FILE_ECODE_TYPE, GetFromJSONFunc)}function SocketListenerFunc () {  var host = server.address().address  var port = server.address().port  console.log('Please visit http://%s:%s', host, port)}// Main Service Code// //app.get('/listUsers', ListUserActionFunc)app.get('/addUser', AddUserActionFunc)app.get('/deleteUser', DeleteUserFunc)app.get('/:id', GetIdFunc)var server = app.listen(8081, SocketListenerFunc)// Test URL// http://127.0.0.1:8081/listUsers// http://127.0.0.1:8081/addUser// http://127.0.0.1:8081/2// http://127.0.0.1:8081/deleteUser