一、path模块
1.1 path
1.2 path.parse(url)
path.parse(url)：返回一个对象：
dir===》path.dirname(url)：返回路径中代表文件夹的部分base===》path.basename(url)：返回路径中的最后一部分ext===》path.extname(url)：返回路径中文件的后缀名name：
- 例1：
const url = 'http://localhost:8080/static/css/index.css'
console.log(path.parse(url))
/*
{ root: '',
dir: 'http://localhost:8080/static/css',
base: 'index.css',
ext: '.css',
name: 'index'
}
*/
console.log(path.dirname(url)) // http://localhost:8080/static/css
console.log(path.basename(url)) // index.css
console.log(path.extname(url)) // .css
- 例2：
const url_2 = 'http://www.jmazm.com/2017/12/25/discrimination-new-and-function-call/'
console.log(path.parse(url_2))
/*
{ root: '',
dir: 'http://www.jmazm.com/2017/12/25',
base: 'discrimination-new-and-function-call',
ext: '',
name: 'discrimination-new-and-function-call'
}
*/
console.log(path.dirname(url_2)) // http://www.jmazm.com/2017/12/25
console.log(path.basename(url_2)) // discrimination-new-and-function-call
console.log(path.extname(url_2)) // ''
1.3 path.resolve()
path.resolve()： 方法会把一个路径或路径片段的序列解析为一个绝对路径。- 给定的路径的序列是从右往左被处理的，后面每个
path被依次解析，直到构造完成一个绝对路径。
const a = '/a'
const b = '/b'
const c = './c'
const d = '../d'
const dirname = __dirname
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\pathModel
console.log(dirname)
// E:\a
console.log(path.resolve(dirname, a))
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\pathModel\c
console.log(path.resolve(dirname, c))
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\d
console.log(path.resolve(dirname, d))
// E:\a
console.log(path.resolve(a))
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\pathModel\c
console.log(path.resolve(c))
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\d
console.log(path.resolve(d))
// E:\b\c
console.log(path.resolve(a, b, c))
// E:\d
console.log(path.resolve(a, b, d))
// E:\b\d
console.log(path.resolve(a, b, c, d))
// E:\a
console.log(path.resolve(c, a))
1.4 path.join()
const http = require('http');
const path = require('path');
const server = http.createServer();
server.on('request', (req, res) => {
if (req.url === '/') {
const a = '/a'
const b = '/b'
const c = './c'
const d = '../d'
const dirname = __dirname
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\pathModel
console.log(dirname)
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\pathModel\a
console.log(path.join(dirname, a))
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\pathModel\c
console.log(path.join(dirname, c))
// E:\projectAndNote\JMHello.github.io\effects\demo\nodejs\d
console.log(path.join(dirname, d))
// \a
console.log(path.join(a))
// c
console.log(path.join(c))
// ..\d
console.log(path.join(d))
// \a\b\c
console.log(path.join(a, b, c))
// \a\d
console.log(path.join(a, b, d))
// \a\b\d
console.log(path.join(a, b, c, d))
// \c\a
console.log(path.join(c, a))
res.end('ok');
}
})
server.listen(3000);