JavaScript uses FileSystemObject to manipulate files and folders

First, the function realizes the core: FileSystemObject object To implement the file manipulation function in JavaScript, the main thing is to rely on the FileSystemObject object. Second, FileSystemObject programming Programming with a FileSystemObject object is simple, typically through the following steps: Creating FileSystemObject objects, applying related methods, and accessing object-related properties. (i) Creating FileSystemObject objects The code to create the FileSystemObject object takes only 1 lines: var fso = new ActiveXObject ("Scripting.FileSystemObject"); After the above code executes, the FSO becomes a FileSystemObject object instance. (ii) Application of relevant methodologies After you create an object instance, you can use the associated methods of the object. For example, use the CreateTextFile method to create a text file: var fso = new ActiveXObject ("Scripting.FileSystemObject"); var f1 = fso.createtextfile ("C://myjstest.txt", true); (iii) Access to object-related properties To access the related properties of an object, you first establish a handle to the object, which is done by the Get series method: Getdrive is responsible for obtaining the drive information, GetFolder is responsible for obtaining the folder information, GetFile is responsible for obtaining the file information. For example, after pointing to the following code, F1 becomes a handle to the file C:/test.txt: var fso = new ActiveXObject ("Scripting.FileSystemObject"); var f1 = fso. GetFile ("C://myjstest.txt"); Then, use F1 to access the associated properties of the object. Like what: var fso = new ActiveXObject ("Scripting.FileSystemObject"); var f1 = fso. GetFile ("C://myjstest.txt"); Alert ("File Last modified:" + F1.) DateLastModified); After the last sentence is executed, the last modified Date attribute value for C:/myjstest.txt is displayed. But one thing. Note: For objects created using the Create method, you do not have to use the Get method to obtain the object handle, and then the handle name created directly by using the Create method can be: var fso = new ActiveXObject ("Scripting.FileSystemObject"); var f1 = fso.createtextfile ("C://myjstest.txt", true); Alert ("File Last modified:" + F1.) DateLastModified); Third, the operation of the driver (drives) Using the FileSystemObject object to programmatically manipulate drives (drives) and folders (Folders) is easy, like interacting with files in a Windows file browser, such as copying, moving folders, and getting the properties of a folder. (i) Drives object properties The drive object is responsible for collecting the contents of the physical or logical drive resource in the system, which has the following properties: L TotalSize: The drive size in bytes (byte). L availablespace or FreeSpace: drive free space calculated in bytes (byte). L DriveLetter: drive letter. L DriveType: Drive type, value is: removable (mobile media), fixed (fixed media), Network (network Resource), CD-ROM, or RAM disk. L SerialNumber: Serial code for the drive. L FileSystem: The file system type of the drive on which the value is fat, FAT32, and NTFS. L IsReady: The drive is available. L ShareName: share name. L VolumeName: Volume label name. L Path and RootFolder: The path of the drive or the name of the root directory. (ii) Drive object manipulation routines The following routines show information such as the volume label, Total capacity, and free space of drive C: var fso, DRV, s = ""; FSO = new ActiveXObject ("Scripting.FileSystemObject"); DRV = FSO. Getdrive (FSO. GetDriveName ("c://")); S + + "Drive C:" + "-"; S + + DRV. VolumeName + "n"; S + + "total space:" + DRV. totalsize/1024; s + = "Kb" + "n"; s + + "free space:" + DRV. freespace/1024; s + = "Kb" + "n"; alert (s); Iv. Operation folder (Folders) Actions that involve folders include creating, moving, deleting, and getting related properties. Folder object Action routines: The following routines practice getting the parent folder name, creating a folder, deleting a folder, and determining whether it is a root directory, and so on: var fso, fldr, S = ""; Create a FileSystemObject object instance FSO = new ActiveXObject ("Scripting.FileSystemObject"); Get Drive Object Fldr = fso. GetFolder ("c://"); Show Parent directory Name Alert ("Parent folder name is:" + Fldr + "n"); Show Drive name Alert ("contained on drive" + Fldr.) Drive + "n"); Determine if the root directory if (Fldr. IsRootFolder) Alert ("This is the root folder."); Else Alert ("This folder isn ' t a root folder."); Alert ("/n/n"); Create a new Folder Fso. CreateFolder ("C://bogus"); Alert ("Created folder C://bogus" + "n"); Displays the folder base name, not including the path name Alert ("Basename =" + FSO.) Getbasename ("C://bogus") + "n"); Delete the Created folder Fso. DeleteFolder ("C://bogus"); Alert ("Deleted folder C://bogus" + "n"); V. Operating documents (FILES) Operations on files are more complex than the drives (Drive) and folders (folder) described above, and are essentially grouped into the following two categories: creation, copying, movement, deletion, and creation, addition, deletion, and reading of file content. The details are detailed below. (i) Create a file There are 3 ways to create an empty text file, which is sometimes called a text stream. The first is the use of the CreateTextFile method. The code is as follows: var fso, F1; FSO = new ActiveXObject ("Scripting.FileSystemObject"); F1 = fso. CreateTextFile ("C://testfile.txt", true); The second is to use the OpenTextFile method and add the ForWriting property, the ForWriting value is 2. The code is as follows: var fso, TS; var forwriting= 2; FSO = new ActiveXObject ("Scripting.FileSystemObject"); TS = fso. OpenTextFile ("C://test.txt", ForWriting, True); The third is to use the OpenAsTextStream method, also set the ForWriting property. The code is as follows: Var fso, F1, TS; var forwriting = 2; FSO = new ActiveXObject ("Scripting.FileSystemObject"); Fso. CreateTextFile ("C://test1.txt"); F1 = fso. GetFile ("C://test1.txt"); TS = F1. OpenAsTextStream (ForWriting, true); (ii) Adding data to documents When a file is created, you typically add data to a file by following the steps of "Open file-> fill data-> close file." You can open a file by using the OpenTextFile method of the FileSystemObject object, or by using the OpenAsTextStream method of the file object. Fill in the data to use the Write, WriteLine, or WriteBlankLines method of the TextStream object. The difference between these 3 is that the Write method does not add a new line break at the end of the write data, the WriteLine method adds a new newline character at the end, and WriteBlankLines adds one or more blank rows. You can use the Close method of the TextStream object by closing the file. (iii) Create files and add data routines The following code combines several steps to create a file, add data, and close a file: var fso, TF; FSO = new ActiveXObject ("Scripting.FileSystemObject"); Create a new file tf = FSO. CreateTextFile ("C://testfile.txt", true); Fill in the data and add line breaks Tf. WriteLine ("Testing 1, 2, 3."); Add 3 Blank Lines Tf. WriteBlankLines (3); Fill in a line without line breaks Tf. Write ("This is a test."); Close File Tf. Close (); (iv) Read the contents of the file Reading data from a text file uses the read, ReadLine, or ReadAll method of the TextStream object. The Read method is used to read a specified number of characters in a file; the ReadLine method reads an entire line, but does not include a newline character; the ReadAll method reads the entire contents of the text file. The read content is stored in a string variable for display, parsing.