


Introduction to javascript system folder file operations and parameters_javascript skills
In the early stage, when the system was operated under .net, it was very complicated to implement the same function. I didn't expect it to be so simple using JavaScript, so I searched for the code on the Internet and improved it.
function PathList(path) {
var fso = new ActiveXObject("Scripting.FileSystemObject");
var fldr = fso.GetFolder(path);
var fd = new Enumerator(fldr.SubFolders);
for (; !fd.atEnd(); fd.moveNext()) {
sd = fd.item();
WScript.Echo(sd.path);
//写入文件
writeFile("a.text",sd.path);
//document.write(sd.path);
PathList(sd.path);
}
}
function FileList(path) {
var fso = new ActiveXObject("Scripting.FileSystemObject");
var fldr = fso.GetFolder(path);
var fd = new Enumerator(fldr.SubFolders);
for (; !fd.atEnd(); fd.moveNext()) {
sd = fd.item();
var fc = new Enumerator(sd.files);
for (; !fc.atEnd(); fc.moveNext())
{
WScript.Echo(fc.item());
writeFile("B.text",fc.item());
}
WScript.Echo(sd.path);
//写入文件
writeFile("a.text",sd.path);
//document.write(sd.path);
FileList(sd.path);
}
}
//当前目录文件
function CurFileList(path) {
var fso = new ActiveXObject("Scripting.FileSystemObject");
var fldr = fso.GetFolder(path);
var fc = new Enumerator(fldr.files);
for (; !fc.atEnd(); fc.moveNext())
{
WScript.Echo(fc.item());
writeFile("c.text",fc.item());
}
}
/*
object.OpenTextFile(filename[, iomode[, create[, format]]])
参数
object
必选项。object 应为 FileSystemObject 的名称。
filename
必选项。指明要打开文件的字符串表达式。
iomode
可选项。可以是三个常数之一:ForReading 、 ForWriting 或 ForAppending 。
create
可选项。Boolean 值,指明当指定的 filename 不存在时是否创建新文件。如果创建新文件则值为 True ,如果不创建则为 False 。如果忽略,则不创建新文件。
format
可选项。使用三态值中的一个来指明打开文件的格式。如果忽略,那么文件将以 ASCII 格式打开。
设置
iomode 参数可以是下列设置中的任一种:
常数 值 描述
ForReading 1 以只读方式打开文件。不能写这个文件。
ForWriting 2 以写方式打开文件
ForAppending 8 打开文件并从文件末尾开始写。
format 参数可以是下列设置中的任一种:
值 描述
TristateTrue 以 Unicode 格式打开文件。
TristateFalse 以 ASCII 格式打开文件。
TristateUseDefault 使用系统默认值打开文件。
*/
//读文件
function readFile(filename){
var fso = new ActiveXObject("Scripting.FileSystemObject");
var f = fso.OpenTextFile(filename,1);
var s = "";
while (!f.AtEndOfStream)
s = f.ReadLine() "n";
f.Close();
return s;
}
//写文件
function writeFile(filename,filecontent){
var fso, f, s ;
fso = new ActiveXObject("Scripting.FileSystemObject");
f = fso.OpenTextFile(filename,8,true);
f.WriteLine(filecontent);
f.Close();
//alert('ok');
WScript.Echo("写入成功");
}
//删除文件
function deleteFile(filename,filecontent){
var fso, f, s ;
fso = new ActiveXObject("Scripting.FileSystemObject");
f = fso.GetFile(filename);
f.Delete();
//alert('ok');
WScript.Echo("删除成功");
}
//批量删除,未删除文件夹,删除不了当前目录文件
function DelFileList(path) {
var fso = new ActiveXObject("Scripting.FileSystemObject");
var fldr = fso.GetFolder(path);
var fd = new Enumerator(fldr.SubFolders);
for (; !fd.atEnd(); fd.moveNext()) {
sd = fd.item();
var fc = new Enumerator(sd.files);
for (; !fc.atEnd(); fc.moveNext())
{
WScript.Echo(fc.item());
writeFile("B.text",fc.item());
fc.item().Delete();
WScript.Echo("删除成功");
}
WScript.Echo(sd.path);
//写入文件
writeFile("a.text",sd.path);
writeFile("a.text","删除完毕");
//document.write(sd.path);
DelFileList(sd.path);
}
}
//删除当前目录文件
function CurDelFileList(path) {
var fso = new ActiveXObject("Scripting.FileSystemObject");
var fldr = fso.GetFolder(path);
var fc = new Enumerator(fldr.files);
for (; !fc.atEnd(); fc.moveNext())
{
WScript.Echo(fc.item());
writeFile("c.text",fc.item());
fc.item().Delete();
writeFile("c.text","删除成功");
}
}
/*
Drive对象负责收集系统中的物理或逻辑驱动器资源内容,它具有如下属性:
l TotalSize:以字节(byte)为单位计算的驱动器大小。
l AvailableSpace或FreeSpace:以字节(byte)为单位计算的驱动器可用空间。
l DriveLetter:驱动器字母。
l DriveType:驱动器类型,取值为:removable(移动介质)、fixed(固定介质)、network(网络资源)、CD-ROM或者RAM盘。
l SerialNumber:驱动器的系列码。
l FileSystem:所在驱动器的文件系统类型,取值为FAT、FAT32和NTFS。
l IsReady: Whether the drive is available.
l ShareName: Share name.
l VolumeName: Volume label name.
l Path and RootFolder: The path or root directory name of the drive.
*/
function getDriveinfo()
{
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";
WScript.Echo(s);
}
CurFileList("D:web_01");
FileList("D:web_01");
getDriveinfo();

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.


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