文件的增删该查

增

var fs = require ( 'fs' );fs.writeFile('路径','hello fs',function(error){      if( error ) throw error      else{           console.log( '增加成功' );}})

改

var fs = require( ' fs ');fs.appendFile ( '路径',' HELLO FS ', 'utf8' ,function( error ){     if( error ) throw error     else{         console.log( ' 修改成功 ' );}})

查

var fs = require( ' fs ');fs.readFile( ' 路径 ', ' utf8 ',functon(error,data){     if( error ) throw error     console.log(data);})

删

var fs = require( 'fs' );fs.unlink( ' 路径 ',function(error){       if( error ) throw error       console.log( '删除成功' );})

目录的增删该查

增

var fs = require( 'fs' );fs.mkdir( '路径',function( errror ){      if( error ) throw error      console.log('目录增加成功')；})

改

var fs = require ( ' fs ');fs.rename('旧路径',‘新路径’,function( error ){      if( error ) throw error      console.log( '修改成功' );})

查

for(var i = 0; i<10; i++){       fs.writeFile('./fs/第${i}.txt',i,function(){              console.log('第${i}个创建成功');       })}var fs = require ( ' fs ' );fs.readdir( '路径',function(error,data){       if( error ) throw error       console.log( data )})

events

var Events = require( 'enents' ) ;class MyEvents extends Events{};var MyEvents = new MyEvents();//console.log( Myevents );声名事件MyEvents.on('a',function(){      console.log( hello events );})触发事件MyEvents.emit('a');