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Node.js — Run JavaScript Everywhere
node -v 查看版本
npx 运行外连接
运行:node test.js
console.log(__dirname);//打印当前所在目录
console.log(__filename);//打印全路径
node js中引入外部,不能使用SE6中的import,会报
Cannot use import statement outside a module
需要被引用的文件
fnTool.js
- let sum_fn = function(a,b){
- return a+b;
- }
-
- module.exports = sum_fn
test.js
- console.log("=======node==开始======");
-
- let sum_fn = require("./fnTool.js");
-
- console.log(sum_fn(3,5));
同步读写
- var readMe = fs.readFileSync("./fnTool.js","utf-8");
- console.log(readMe)
异步读写
- //====================异步=============
-
- var reader = fs.readFile("./fnTool.js","utf-8",function(err,data){
- fs.writeFile("./newFile1.js",data,function(){
- console.log("读写完成");
- });
- });
文件流:
读:
- let readerStream = fs.createReadStream(__dirname+"/fnTool.js","utf-8");
- let data = "";
- readerStream.on("data",function(chunk){
- data+=chunk;
- });
-
- readerStream.on("end",function(){
- console.log(data);
- });
写:
- var writerStream = fs.createWriteStream(__dirname+"/newFile.js","utf-8");
- writerStream.write("NODE JS");
- writerStream.end();
- writerStream.on("finish",function(){
- console.log("写入完成");
- });
读写:
- let readerStream = fs.createReadStream(__dirname+"/fnTool.js","utf-8");
- var writerStream = fs.createWriteStream(__dirname+"/newFile.js","utf-8");
- let data = "";
- readerStream.on("data",function(chunk){
- writerStream.write(chunk);
- });
-
- readerStream.on("end",function(){
- console.log("读出完成");
- });
管道写:
- let readerStream = fs.createReadStream(__dirname+"/fnTool.js","utf-8");
- var writerStream = fs.createWriteStream(__dirname+"/newFile.js","utf-8");
- readerStream.pipe(writerStream);
- console.log("=======node==开始======");
-
- let http = require("http");
-
- var server = http.createServer(function(req,res){
- console.log("la la la");
- });
- server.listen(3000,"127.0.0.1");
访问它
后端就会显示:
- console.log("=======node==开始======");
-
-
- let http = require("http");
-
- var server = http.createServer(function(req,res){
- //设置返回内容
- res.writeHead(200,{
- "Content-Type":"text/plain"
- });
- res.end("Hello world");
- });
-
- server.listen(3000,"127.0.0.1");
- console.log("=======node==开始======");
-
-
- let http = require("http");
- let fs = require("fs");
-
- var server = http.createServer(function(req,res){
- //设置返回内容
- res.writeHead(200,{
- "Content-Type":"text/html"
- });
-
- var reader = fs.createReadStream(__dirname+"/list.html");
- reader.pipe(res);//直接通过管道写入 返回
-
- });
-
- server.listen(3000,"127.0.0.1");
![](https://csdnimg.cn/release/blogv2/dist/pc/img/newCodeMoreWhite.png)
- let http = require("http");
- let fs = require("fs");
-
- var server = http.createServer(function(req,res){
- //设置返回内容
- res.writeHead(200,{
- "Content-Type":"text/json"
- });
- let json = {a:"1",b:"2",c:"中国"};
-
- res.end(JSON.stringify(json));
-
- });
-
- server.listen(3000,"127.0.0.1");
- const Events = require("events");
-
- const myEvent= new Events();
-
- myEvent.on("done",()=>{
- console.log("事件执行完成");
- });
-
- myEvent.on("done",()=>{
- console.log("事件执行完成22");
- });
-
- myEvent.emit("done");
- console.log("=======node==开始======");
- let buf = Buffer.alloc(6);
- buf.fill('3')
- console.log(buf.toString())
-
- let b1 = Buffer.from('中国');
- let b2 = Buffer.from('人民');
-
- let b = Buffer.concat([b1,b2],9);
- console.log(b.toString());
nodemon插件使用
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