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                # 1.以路由器為例 - 在NodeJS中 JS的用途是`操作磁盤文件`或搭建`HTTP服務器`,NodeJS就相應提供了`fs`、`http`等內置對象。 ~~~ req -->客戶端的請求 res -->服務器的響應 寫一個"hello world" const http = require("http"); const fs =require("fs"); http.createServer(function(req,res){ res.write("hello world"); res.end() }).listen(8081) ~~~ 建立 ![](https://i.loli.net/2019/03/08/5c82617b1d115.png) 做一個客戶端,啟動后,在搜索引擎中 輸入localhost:8081(即端口8081),輸出404。輸入localhost:8081/about.html,輸出about。輸入localhost:8081/index.html,輸出index。 在server.js中寫(固定格式) ~~~ const http = require("http"); const fs =require("fs"); http.createServer(function(req,res){ // 獲取前臺輸入的url地址(并打印 var url = req.url; // console.log(url); var filename='./www'+url; fs.readFile(filename,function(err,data){ if(err){ res.write("404") }else{ res.write(data) } res.end() }) }).listen(8081) ~~~ # 2.啟動 Ctrl + `? 打開默認終端; ![](https://i.loli.net/2019/03/08/5c8266d5dedad.png) ~~~ 命令行中打 cd http-fs 固定路徑到想要的地方 ~~~ ![](https://i.loli.net/2019/03/08/5c8266db984d5.png) ~~~ 啟動 node server.js ~~~ Ctrl +?Shift + `? 新建新的終端; Ctrl + Shift + Y? 打開調試控制臺,然后再自行切換終端選項; ps: ` 在鍵盤數字1的左邊,? Ctrl 和 Shift 在鍵盤左下角. ## 控制臺會有錯誤提醒的,細心點 > 此處錯誤是拼寫出錯 ![](https://i.loli.net/2019/03/08/5c824945392a7.png)
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