var path = require(‘path‘);//  当发现有多个连续的斜杠时，会替换成一个； 当路径末尾包含斜杠时，会保留；// 在 Windows 系统会使用反斜杠。var p = path.normalize(‘foo/bar//baz/asdf/quux/..‘) ;var p2 = path.normalize(‘foo/bar//baz/asdf/quux/../‘) ;console.log(‘p‘,p,p2);//组合参数中的所有路径，返回规范化后的路径。var p3 = path.join(‘a/b/c‘,"d/c/v");console.log(‘p3‘,p3);// 返回文件的绝对路径var p4 = path.resolve(‘test.js‘);var p5 = path.resolve(‘/path/test.js‘);console.log(‘p4‘,p4);console.log(‘p5‘,p5);//  var ab = path.isAbsolute(‘test.js‘);//  console.log(‘ab‘,ab);//  返回从 from 到 to 的相对路径var res = path.relative(‘/data/orandea/test/aaa‘, ‘/data/orandea/impl/bbb‘);console.log(‘res‘,res);//path.resolve(from, path.relative(from, to)) == path.resolve(to)// 文件的文件夹名称var dir1 = path.dirname(‘../test.js‘);var dir2 = path.dirname(‘./test.js‘);var dir3 = path.dirname(‘test.js‘);var dir4 = path.dirname(‘/foo/bar/baz/asdf/quux‘);//dir1 ..//dir2 .//dir3 .//dir4 /foo/bar/baz/asdfconsole.log(‘dir1‘,dir1);console.log(‘dir2‘,dir2);console.log(‘dir3‘,dir3);console.log(‘dir4‘,dir4);// 返回后文件基本名称 第二个参数为 后缀名如果存在则返回除去后缀以后的名字var base1 = path.basename(‘/foo/bar/baz/asdf/quux.html‘, ‘.html‘);var base1 = path.basename(‘/foo/bar/baz/asdf/quux.html‘, ‘.htm‘);var base2 = path.basename(‘/foo/bar/baz/asdf/quux.html‘, ‘html‘);var base3 = path.basename(‘/foo/bar/baz/asdf/quux.html‘);//  base1 quux//  base2 quux.//  base3 quux.htmlconsole.log(‘base1‘,base1);console.log(‘base2‘,base2);console.log(‘base3‘,base3);// 返回后缀名，  没有则为空var en1 = path.extname(‘test.js‘);var en2 = path.extname(‘test‘);console.log(‘en1 ‘, en1);console.log(‘en2 ‘, en2);//en1  .js//en2// path.sep 路径分隔符var sp = ‘foo/bar/baz‘.split(path.sep);//sp [ ‘foo‘, ‘bar‘, ‘baz‘ ]console.log(‘sp‘, sp);// path.delimiter多个路径之间的分隔符var del = process.env.PATH .split(path.delimiter);console.log(‘del‘, del);//de [ ‘/usr/local/bin‘,//    ‘/usr/bin‘,//    ‘/bin‘,//    ‘/usr/sbin‘,//    ‘/sbin‘,//    ‘/usr/local/bin‘,//    ‘/usr/local/git/bin‘ ]