02_Node js 基礎模組（http，url）

摘要： http.js const http = require('http'); const hostname = '127.0.0.1'; const port = 3000; const server = http.createServer((request,...

http.js

const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((request, response) => {
response.statusCode = 200;
response.setHeader('Content-Type', 'text/plain;charset=utf-8');
response.end('http 模組。');
});
server.listen(port, hostname, () => {
console.log(`伺服器執行在 http://${hostname}:${port}`);
});
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執行 node http.js，訪問：127.0.0.1:3000/

二、url 模組

url.js

const url = require('url');
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((request, response) => {
// 過濾掉 request.url == '/favicon.ico' 的情況，否則會列印兩次結果
if (request.url != '/favicon.ico') {
console.log(url);
};
response.statusCode = 200;
response.setHeader('Content-Type', 'text/plain;charset=utf-8');
response.end('url 模組。');
});
server.listen(port, hostname, () => {
console.log(`伺服器執行在 http://${hostname}:${port}`);
});
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執行 node url.js，訪問：127.0.0.1:3000/

{ parse: [Function: urlParse],
resolve: [Function: urlResolve],
resolveObject: [Function: urlResolveObject],
format: [Function: urlFormat],
URL:
{ [Function: URL]
originFor: [Function],
domainToASCII: [Function],
domainToUnicode: [Function] },
Url: [Function: Url] }
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2.1 url 模組下 parse 函式

1、parse(獲取地址資訊)

parse.js

const url = require('url');
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((request, response) => {
if (request.url != '/favicon.ico') {
console.log(url.parse('http://www.baidu.com'));
};
response.statusCode = 200;
response.setHeader('Content-Type', 'text/plain;charset=utf-8');
response.end('url 模組下 parse 函式。');
});
server.listen(port, hostname, () => {
console.log(`伺服器執行在 http://${hostname}:${port}`);
});
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執行 node parse.js，訪問：127.0.0.1:3000/

Url {
protocol: 'http:',
slashes: true,
auth: null,
host: 'www.baidu.com',
port: null,
hostname: 'www.baidu.com',
hash: null,
search: null,
query: null,
pathname: '/',
path: '/',
href: 'http://www.baidu.com/' }
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2、parse（傳入引數）

parse2.js

const url = require('url');
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((request, response) => {
if (request.url != '/favicon.ico') {
console.log(url.parse('http://www.baidu.com?name=liu'));
};
response.statusCode = 200;
response.setHeader('Content-Type', 'text/plain;charset=utf-8');
response.end('url 模組下 parse 函式（傳入引數）。');
});
server.listen(port, hostname, () => {
console.log(`伺服器執行在 http://${hostname}:${port}`);
});
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執行 node parse2.js，訪問：127.0.0.1:3000/

Url {
protocol: 'http:',
slashes: true,
auth: null,
host: 'www.baidu.com',
port: null,
hostname: 'www.baidu.com',
hash: null,
search: '?name=liu',
query: 'name=liu',
pathname: '/',
path: '/?name=liu',
href: 'http://www.baidu.com/?name=liu' }
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3、parse（parse 擴充套件）

parse3.js

const url = require('url');
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((request, response) => {
if (request.url != '/favicon.ico') {
/*
parse 方法可以傳兩個引數：
第一個引數是地址。
第二個引數是 true 的話表示把 get 傳值轉換成物件。
*/
const result = url.parse(request.url, true);
console.log(result);
console.log(result.query.userName);
console.log(result.query.userAge);
};
response.statusCode = 200;
response.setHeader('Content-Type', 'text/plain;charset=utf-8');
response.end('url 模組下 parse 函式（parse 擴充套件）。');
});
server.listen(port, hostname, () => {
console.log(`伺服器執行在 http://${hostname}:${port}`);
});
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執行 node parse3.js，訪問：127.0.0.1:3000/?userName=liu&userAge=24

Url {
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: '?userName=liu&userAge=24',
query: { userName: 'liu', userAge: '24' },
pathname: '/',
path: '/?userName=liu&userAge=24',
href: '/?userName=liu&userAge=24' }
liu
24
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2.2 url 模組下 format 函式

format: 逆向 parse。

format.js

const url = require('url');
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((request, response) => {
if (request.url != '/favicon.ico') {
console.log(url.format({
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: '?userName=liu&userAge=24',
query: {
userName: 'liu',
userAge: '24'
},
pathname: '/',
path: '/?userName=liu&userAge=24',
href: '/?userName=liu&userAge=24'
}));
};
response.statusCode = 200;
response.setHeader('Content-Type', 'text/plain;charset=utf-8');
response.end('url 模組下 format 函式。');
});
server.listen(port, hostname, () => {
console.log(`伺服器執行在 http://${hostname}:${port}`);
});
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執行 node format.js，訪問：127.0.0.1:3000/

/?userName=liu&userAge=24
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2.3 url 模組下 resolve 函式

resolve: 追加或替換地址。

resolve.js

const url = require('url');
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((request, response) => {
if (request.url != '/favicon.ico') {
console.log(url.resolve('127.0.0.1:3000/?userName=liu&userAge=24', 'userName=zhao'));
};
response.statusCode = 200;
response.setHeader('Content-Type', 'text/plain;charset=utf-8');
response.end('url 模組下 resolve 函式。');
});
server.listen(port, hostname, () => {
console.log(`伺服器執行在 http://${hostname}:${port}`);
});
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執行 node resolve.js，訪問：127.0.0.1:3000/

127.0.0.1:3000/userName=zhao
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