Node.js学习笔记

新建http服务

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var http = require('http');
http.createServer(function (request, response)  {
    response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
    if(request.url!=="/favicon.ico"){
        console.log('访问');
        response.write('hello,world');
        response.end("response.end");
    }
}).listen(8000);
console.log("Server running at http://127.0.0.1:8000/");

使用function

目录结构

tp@V:/mnt/d/Node.js$ tree
.
├── hello.js
├── models
│ └── otherfuns.js
└── n2_funcall.js
n2_funcall.js

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var http = require('http');
var otherfun = require("./models/otherfuns.js");
http.createServer(function (request, response){
		response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
	if(request.url!=="/favicon.ico"){
		otherfun['fun3'](response);
		otherfun['fun2'](response);//也可以用otherfun.fun2(response)
		response.end("response.end");
	}
}).listen(8000);
console.log("Server running at http://127.0.0.1:8000/");

otherfuns.js

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module.exports={
	fun2:function(res){
		console.log("我是fun2");
		res.write("Hello, I am fun2");
	},
	fun3:function(res){
		console.log("I am fun3");
		res.write("Hello, I am fun3");
	}
}

效果

使用模块

models/User.js

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function User(id, name, age){
	this.id=id;
	this.name=name;
	this.age=age;
	this.enter=function(){
		console.log(this.name+"进入图书馆");
	}
}
module.exports = User;

models/Teacher.js

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var User = require('./User');
function Teacher(id,name,age){
	User.apply(this,[id,name,age]);
	this.teach=function(res){
		res.write(this.name+"讲课");
	}
}
module.exports = Teacher;
```JavaScript
>n3_modelcall.js

var http = require(‘http’);

// var User = require(“./models/User”);
var Teacher = require(“./models/Teacher”)

http.createServer(function (request, response){
response.writeHead(200, {‘Content-Type’: ‘text/html; charset=utf-8’});
if(request.url!==”/favicon.ico”){
//funname = ‘fun3’;
teacher = new Teacher(1,’我来’,18);
// user.id =1;
// user.name=’我来’;
// user.age=18;
teacher.enter();
teacher.teach(response);
response.end(“response.end”);
}

}).listen(8000);
console.log(“Server running at http://127.0.0.1:8000/“);

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![](https://ww2.sinaimg.cn/large/006tNc79gy1fdtdb7fgu8j30b8058gln.jpg)
# 使用路由
>models/route.js
```JavaScript
module.exports={
	login:function(req, res){
		res.write("I am login module.");
	},
	admin:function(req, res){
		res.write("I am admin module.");
	}
}

n4_rout.js

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var http = require('http');
var url = require('url');
var router = require('./models/route');
http.createServer(function (request, response){
	response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
	if(request.url!=="/favicon.ico"){
		var pathname = url.parse(request.url).pathname;
		pathname = pathname.replace(/\//, '');
		console.log(pathname);
		router[pathname](request, response);
		response.end("response.end");
	}
}).listen(8000);
console.log("Server running at http://127.0.0.1:8000/");

读文件

models/route.js

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var optfile = require('./optfile');
module.exports={
	login:function(req, res){
		function recall(data){
			res.write(data);
			res.end(" ");
		}
		optfile.readfile('./views/login.html', recall);
	},
	admin:function(req, res){
		function recall(data){
			res.write(data);
			res.end(" ");
		}
		optfile.readfile('./views/admin.html', recall);
	}
}

models/optfile.js

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var fs = require('fs');
module.exports = {
	readfileSync:function(path){//同步读取
		var data = fs.readFileSync(path, 'utf-8');
		console.log(data);
		console.log('同步方法执行完毕');
	},
	readfile:function(path, recall){//异步读取
		fs.readFile(path, function(err, data){
			if(err){
				console.log(err);
		}else{
			console.log(data.toString());
			recall(data);
		}
	});
	console.log('异步方法执行完毕');
}
}

n5_readfile.js

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var http = require('http');
var url = require('url');
var router = require('./models/route');
//var optfile = require('./models/optfile');
http.createServer(function (request, response){
	response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
	if(request.url!=="/favicon.ico"){
		var pathname = url.parse(request.url).pathname;
		pathname = pathname.replace(/\//, '');
		console.log(pathname);
		router[pathname](request, response);
	}
}).listen(8000);
console.log("Server running at http://127.0.0.1:8000/");

views/login.html

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This is login page.

views/admin.html

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This is admin page.

读文件

写文件

models/optfile.js

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var fs = require('fs');
module.exports = {
	writefile:function(path, data, recall){//异步方式
		fs.writeFile(path, data, function (err){
			if (err){
				throw err;
			}
			console.log('It\'s Saved!');//文件被保存
			recall("write file success.");
		});
	},
	writeFileSync:function(path, data){//同步方式
		fs.writeFileSync(path, data);
		console.log("同步写文件完成");
	}
}

models/route.js

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var optfile = require('./optfile');
module.exports={
	login:function(req, res){
		function recall(data){
			res.write(data);
			res.end(" ");
		}
		optfile.readfile('./views/login.html', recall);
	},
	admin:function(req, res){
		function recall(data){
			res.write(data);
			res.end(" ");
		}
		optfile.readfile('./views/admin.html', recall);
	},
	writefile:function(req, res){
		function recall(data){
			res.write(data);
			res.end(" ");
		}
		optfile.writefile('./views/test.txt', 'write file ok1.', recall);
	}
}

n6_writefile.js

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var http = require('http');
var url = require('url');
var router = require('./models/route');
//var optfile = require('./models/optfile');
http.createServer(function (request, response){
	response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
	if(request.url!=="/favicon.ico"){
		var pathname = url.parse(request.url).pathname;
		pathname = pathname.replace(/\//, '');
		console.log(pathname);
		router[pathname](request, response);
	}
}).listen(8000);
console.log("Server running at http://127.0.0.1:8000/");

写文件

读取图片

models/optfile.js
仅能显示图片

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var fs = require('fs');
module.exports = {
	readImg:function(path, res){
		fs.readFile(path, 'binary', function(err, file){
			if (err){
				console.log(err);
				return;
			}else{
				console.log('输出文件');
				res.write(file, 'binary');
				res.end();
			}
		});
	}
}

n7_readimg.js

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var http = require('http');
var optfile = require('./models/optfile');
http.createServer(function (request, response){
	response.writeHead(200, {'Content-Type': 'image/jpeg'});
	if(request.url!=="/favicon.ico"){
    console.log('访问');
    optfile.readImg('./images/1.png', response);
		console.log("move on");
	}
}).listen(8000);
console.log("Server running at http://127.0.0.1:8000/");

读取图片

路由改造

models/optfile.js
可显示文本和图片

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var fs = require('fs');
module.exports = {
	writefile:function(path, data, recall){//异步方式
		fs.writeFile(path, data, function (err){
			if (err){
				throw err;
			}
			console.log('It\'s Saved!');//文件被保存
			recall("write file success.");
		});
	},
	writeFileSync:function(path, data){//同步方式
		fs.writeFileSync(path, data);
		console.log("同步写文件完成");
	},
	readImg:function(path, res){
		fs.readFile(path, 'binary', function(err, file){
			if (err){
				console.log(err);
				return;
			}else{
				console.log('输出文件');
				res.write(file, 'binary');
				res.end();
			}
		});
	},
	readfile:function(path, recall){//异步读取
			fs.readFile(path, function(err, data){
					if(err){
							console.log(err);
			}else{
					console.log(data.toString());
					recall(data);
			}
	});
	console.log('异步方法执行完毕');
},
}

models/route.js

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var optfile = require('./optfile');
function getRecall(req, res){
	res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
	function recall(data){
		res.write(data);
		res.end(" ");
	}
	return recall;
}
module.exports={
	login:function(req, res){
		recall = getRecall(req, res);
		optfile.readfile('./views/login.html', recall);
	},
	admin:function(req, res){
		function recall(data){
			res.write(data);
			res.end(" ");
		}
		optfile.readfile('./views/admin.html', recall);
	},
	writefile:function(req, res){
		function recall(data){
			res.write(data);
			res.end(" ");
		}
		optfile.writefile('./views/test.txt', 'write file ok1.', recall);
	},
	showimg:function(req, res){
		res.writeHead(200, {'Content-Type': 'image/jpeg'});
		optfile.readImg('./images/1.png', res);
	}
}

n8_routhtml.js

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var http = require('http');
var url = require('url');
var router = require('./models/route');
http.createServer(function (request, response){
	if(request.url!=="/favicon.ico"){
		var pathname = url.parse(request.url).pathname;
		pathname = pathname.replace(/\//, '');
		console.log(pathname);
		router[pathname](request, response);
	}
}).listen(8000);
console.log("Server running at http://127.0.0.1:8000/");

路由改造效果图

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tag:

    缺失模块。
    1、在博客根目录（注意不是yilia根目录）执行以下命令：
    npm i hexo-generator-json-content --save

    2、在根目录_config.yml里添加配置： 

      jsonContent:
    meta: false
    pages: false
    posts:
      title: true
      date: true
      path: true
      text: true
      raw: false
      content: false
      slug: false
      updated: false
      comments: false
      link: false
      permalink: false
      excerpt: false
      categories: false
      tags: true

这个人很懒,什么都没留下