fs.exists = function(path, callback) {if (!nullCheck(path, cb)) return;var req = new FSReqWrap();req.oncomplete = cb;binding.stat(pathModule._makeLong(path), req);function cb(err, stats) {if (callback) callback(err ? false : true);}
};fs.existsSync = function(path) {try {nullCheck(path);binding.stat(pathModule._makeLong(path));return true;} catch (e) {return false;}
};

// Static method to set the stats properties on a Stats object.
fs.Stats = function(dev,mode,nlink,uid,gid,rdev,blksize,ino,size,blocks,atim_msec,mtim_msec,ctim_msec,birthtim_msec) {this.dev = dev;this.mode = mode;this.nlink = nlink;this.uid = uid;this.gid = gid;this.rdev = rdev;this.blksize = blksize;this.ino = ino;this.size = size;this.blocks = blocks;this.atime = new Date(atim_msec);this.mtime = new Date(mtim_msec);this.ctime = new Date(ctim_msec);this.birthtime = new Date(birthtim_msec);
};// Create a C++ binding to the function which creates a Stats object.
binding.FSInitialize(fs.Stats);fs.Stats.prototype._checkModeProperty = function(property) {return ((this.mode & constants.S_IFMT) === property);
};fs.Stats.prototype.isDirectory = function() {return this._checkModeProperty(constants.S_IFDIR);
};fs.Stats.prototype.isFile = function() {return this._checkModeProperty(constants.S_IFREG);
};fs.Stats.prototype.isBlockDevice = function() {return this._checkModeProperty(constants.S_IFBLK);
};fs.Stats.prototype.isCharacterDevice = function() {return this._checkModeProperty(constants.S_IFCHR);
};fs.Stats.prototype.isSymbolicLink = function() {return this._checkModeProperty(constants.S_IFLNK);
};fs.Stats.prototype.isFIFO = function() {return this._checkModeProperty(constants.S_IFIFO);
};fs.Stats.prototype.isSocket = function() {return this._checkModeProperty(constants.S_IFSOCK);
};// Don't allow mode to accidentally be overwritten.
['F_OK', 'R_OK', 'W_OK', 'X_OK'].forEach(function(key) {Object.defineProperty(fs, key, {enumerable: true, value: constants[key] || 0, writable: false});
});

var fs = require('fs');
fs.stat('file_stats.js', function (err, stats) {if (!err){console.log('stats: ' + JSON.stringify(stats, null, '  '));console.log(stats.isFile() ? "Is a File" : "Is not a File");console.log(stats.isDirectory() ? "Is a Folder" : "Is not a Folder");console.log(stats.isSocket() ? "Is a Socket" : "Is not a Socket");stats.isDirectory();stats.isBlockDevice();stats.isCharacterDevice();//stats.isSymbolicLink(); //only lstat
    stats.isFIFO();stats.isSocket();}
});

"C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\bin\runnerw.exe" F:\nodejs\node.exe file_stats.js
stats: {"dev": 1086025760,"mode": 33206,"nlink": 1,"uid": 0,"gid": 0,"rdev": 0,"ino": 12384898975555938,"size": 535,"atime": "2016-03-12T04:09:24.523Z","mtime": "2014-11-10T22:12:29.000Z","ctime": "2016-03-21T11:39:54.207Z","birthtime": "2016-03-12T04:09:24.523Z"
}
Is a File
Is not a Folder
Is not a SocketProcess finished with exit code 0

/*** Created by Administrator on 2016/3/22.*/
var fs = require('fs');
var Path = require('path');
function WalkDirs(dirPath){console.log(dirPath);fs.readdir(dirPath, function(err, entries){for (var idx in entries){var fullPath = Path.join(dirPath, entries[idx]);(function(fullPath){fs.stat(fullPath, function (err, stats){if (stats && stats.isFile()){console.log(fullPath);} else if (stats && stats.isDirectory()){WalkDirs(fullPath);}});})(fullPath);}});
}
WalkDirs("../");

"C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\bin\runnerw.exe" F:\nodejs\node.exe file_readdir.js
../
..\.idea
..\data
..\asyncReadWrite.js
..\Buffer.js
..\Immediate.js
..\Console.js
..\Interval.js
..\nexttick.txt
..\OpenClose.js
..\StreamReadWrite.js
..\syncReadWrite.js
..\nexttick1.txt
..\.idea\.name
..\.idea\encodings.xml
..\.idea\jsLibraryMappings.xml
..\.idea\misc.xml
..\.idea\modules.xml
..\.idea\NodeJsDemo.iml
..\.idea\workspace.xml
..\nexttick2.txt
..\data\config.txt
..\timer.js
..\SimpleReadWrite.js
..\data\file_readdir.js
..\data\grains.txt
..\data\fruit.txt
..\data\openColse1.txt
..\data\veggie.txt
..\data\openClose.txtProcess finished with exit code 0

fs.unlink("../nexttick1.txt", function(err){console.log(err ? "File Delete Failed" :  "File Deleted");
});

"C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\bin\runnerw.exe" F:\nodejs\node.exe file_readdir.js
File DeletedProcess finished with exit code 0

fs.truncate("test.txt",8,function(err){console.log(err?"File Truncate Failed":"File Truncated")
})

fs.mkdir("../test",function(err){console.log(err?"mkdir Failed":"mkdir success")if(!err){rmdir();}
});
function rmdir()
{fs.rmdir("../test",function(err){console.log(err?"rmdir Failed":"rmdir success")});
}

"C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\bin\runnerw.exe" F:\nodejs\node.exe file_readdir.js
mkdir success
rmdir successProcess finished with exit code 0

fs.rename("test","../test1",function(err){console.log(err ? "rename Failed" :  "renamed");
})

"C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\bin\runnerw.exe" F:\nodejs\node.exe file_readdir.js
renamedProcess finished with exit code 0

fs.watchFile("../test1",{persistent:true,interval:5000},function(curr,prev){console.log(curr.mtime);console.log(prev.mtime);
});
fs.rename("../test1","test",function(err){console.log(err ? "rename Failed" :  "renamed");
})

"C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\bin\runnerw.exe" F:\nodejs\node.exe file_readdir.js
renamed
Thu Jan 01 1970 08:00:00 GMT+0800 (中国标准时间)
Tue Mar 22 2016 19:30:11 GMT+0800 (中国标准时间)