【Node】fs

var fs = require('fs') // fs 文件系统

var stdin = process.stdin

var stdout = process.stdout

var stats = []



fs.readdir(process.cwd(), function(err, files) {

    console.log('')

    if (!files.length) {

        return console.log('    \003[31m No files to show!\003[39\n')

    }

    console.log('    Select which file or directory you want to see\n')



    function file(i) {

        var filename = files[i]

        fs.stat(__dirname + '/' + filename, function(err, stat) { // fs.stat会给出文件或目录的元数据

            stats[i] = stat

            if (stat.isDirectory()) {

                console.log('    '+i+'    \033[36m' + filename + '/\033[39m')

            } else {

                console.log('    '+i+'    \033[90m' + filename + '/\033[39m')

            }

            if (++i == files.length) {

                read()

            } else {

                file(i)

            }

        })

    }

    function read() {

        console.log('')

        stdout.write('    \033[33mEnter you choice: \033[39m')

        stdin.resume()

        stdin.setEncoding('utf-8')

        stdin.on('data', option)

    }



    function option(data) {

        var filename = files[Number(data)]

        if (!filename) {

            stdout.write('   \033[31mEnter your choice: \033[39m')

        } else {

            stdin.pause()

            if (stats[Number(data)].isDirectory()) {

                fs.readdir(__dirname + '/' + filename, function(err, files) {

                    console.log('')

                    console.log('    (' + files.length + ' files)')

                    files.forEach(function(file) {

                        console.log('    -    ' + file)

                    })

                    console.log('')

                })

            } else {

                fs.readFile(__dirname + '/' + filename, 'utf-8', function(err, data) {

                    console.log('')

                    console.log('\033[90m' + data.replace(/(.*)/g, '    $1') + '\033[39m')

                })

            }

        }

    }



    file(0)

})

 

console.log('Hello world')

process.stdout.write('Hello world')

console.log('Hello world')

console.log内部做了这样的事情：它在指定的字符串后加上\n（换行）字符，并将其写到stdout流中