看此篇文章前如若你不了解也不会简单运用mongodb请戳这里
1.安装mongodb依赖，这里我们安装v2.2.33版本，如果之前有遇到过db.collection is not function 其实只是mongodb库版本的问题(桌面建立fml文件)
我的项目文件名为fmlC:\Users\admin\Desktop\fml> npm install mongodb@2.2.332.插入数据
在fml中新建node-mongodb.js,并复制黏贴下面代码
var MongoClient = require('mongodb').MongoClient;// 连接数据库 字符串形式var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml'; var insertData = function(db, callback) { //连接到表 fmlsite var collect = db.collection('fmenglsite'); //插入数据 var data = [{"author":"风慕李","url":"http://www.jianshu.com/u/96432503edfd","description":"good good study"}]; collect.insert(data, function(err, result) { if(err){ console.log('Error:'+ err); return; } callback(result); });}MongoClient.connect(DB_CONNECT_STR, function(err, db) { console.log("connect server success！"); insertData(db, function(result) { console.log(result); db.close(); });});如若你也是vscode的使用者，快捷键Ctrl+`执行node node-mongodb.js
C:\Users\admin\Desktop\fml> node node-mongodb.jsconnect server success！{ result: { ok: 1, n: 1 }, ops: [ { author: '风慕李', url: 'http://www.jianshu.com/u/96432503edfd', description:'good good study', _id: 5a28ffd2241ba235a4d51535 } ], insertedCount: 1, insertedIds: [ 5a28ffd2241ba235a4d51535 ] }你也可以通过mongodb客户端使用show dbs等语法查看（忘记了就戳这里）
3.查询数据
var MongoClient = require('mongodb').MongoClient;var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml'; var searchData = function(db, callback) { //连接到表 var collection = db.collection('fengmlsite'); //查询数据 var dataStr = {"description":'good good study'}; collection.find(dataStr).toArray(function(err, result) { if(err){ console.log('Error:'+ err); return; } callback(result); });}MongoClient.connect(DB_CONNECT_STR, function(err, db) { console.log("connect server success"); searchData(db, function(result) { console.log(result); db.close(); });});结果打印（如果返回为[]，或许你需要等待一会，或者)
C:\Users\admin\Desktop\fml> node node-search.jsconnect server success[ { _id: 5a2907838e6f0939908741a9, author: '风慕李', url: 'http://www.jianshu.com/u/96432503edfd', description: 'good good study' } ]4.更新数据
var MongoClient = require('mongodb').MongoClient;var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';var updateData = function(db, callback) { //连接到表 var collection = db.collection('fengmlsite'); //更新数据 var dataStr = {"author":'风慕李'}; var updateStr = {$set: { "description" : "day day up" }}; collection.update(dataStr,updateStr, function(err, result) { if(err){ console.log('Error:'+ err); console.log(0) return; } callback(result); });} MongoClient.connect(DB_CONNECT_STR, function(err, db) { console.log("connect server success"); updateData(db, function(result) { console.log(result); db.close(); });});终端输入
C:\Users\admin\Desktop\fml> node node-update.js我们重新运行node-search.js会发现结果为空，我们在将node-search.js的查询条件datastr改为 {"author":'风慕李'}。你会看到如下结果：C:\Users\admin\Desktop\fml> node node-search.jsconnect server success[ { _id: 5a2907838e6f0939908741a9, author: '风慕李', url: 'http://www.jianshu.com/u/96432503edfd', description: 'day day up' } ] 这时你会看到description字段已经被更新了5.删除数据
var MongoClient = require('mongodb').MongoClient;var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml'; var delData = function(db, callback) { //连接到表 var collection = db.collection('fengmlsite'); //删除数据 var dataStr = {"author":'风慕李'}; collection.remove(dataStr, function(err, result) { if(err){ console.log('Error:'+ err); return; } callback(result); });} MongoClient.connect(DB_CONNECT_STR, function(err, db) { console.log("connect server success！"); delData(db, function(result) { console.log(result); db.close(); });});终端输入
C:\Users\admin\Desktop\fml> node node-delete.js我们重新运行node-search.js会发现结果为空,说明删除成功了注：开始前记得运行mongodb服务（手动运行mongod.exe和mongo.exe或者用命令）
PS：如此一来，前端就可以愉快的操作后台，对于前端的我们来说开心不言而喻。
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