描述 | 语言要素 |
在 TextStream 文件中,如果文件指针越过了行尾标志,返回 True;否则返回 False。 | AtEndOfLine 属性 |
如果文件指针在 TextStream 文件的末尾,返回 True;否则返回 False。 | AtEndOfStream 属性 |
设置或返回文件或者文件夹的属性。 | Attributes 属性 |
给用户返回指定驱动器或网络共享上可用空间的总数。 | AvailableSpace 属性 |
返回 TextStream 文件中当前字符位置的列号。 | Column 属性 |
为 Dictionary 对象中的比较字符串键值设置并返回比较方式。 | CompareMode 属性 |
返回集合或者 Dictionary 对象中项目的数量。 | Count 属性 |
返回指定的文件或文件夹被创建的日期和时间。 | DateCreated 属性 |
返回指定的文件或文件夹上一次被访问的日期和时间。 | DateLastAccessed 属性 |
返回指定的文件或文件夹上次被修改的日期和时间。 | DateLastModified 属性 |
返回指定文件或文件夹所在驱动器的驱动器号。 | Drive 属性 |
返回本地驱动器或网络共享的驱动器号。 | DriveLetter 属性 |
返回一个 Drives 集合,该集合包含了本地机上所有可用 Drive 对象。 | Drives 属性 |
返回一个值,该值表示指定驱动器的类型。 | DriveType 属性 |
返回一个 Files 集合,该集合包含了指定文件夹中包含的所有 File 对象(包括那些具有隐含和系统文件属性设置的对象)。 | Files 属性 |
返回正用于指定驱动器的文件系统的类型。 | FileSystem 属性 |
向用户返回指定的驱动器或网络共享上总的可用空间。 | FreeSpace 属性 |
如果指定的驱动器已就绪,返回 True;否则返回 False。 | IsReady 属性 |
如果指定的文件夹是根文件夹,返回 True;否则返回 False。 | IsRootFolder 属性 |
为 Dictionary 对象中的指定的键值设置或返回一个项目。 | Item 属性 |
在 Dictionary 对象中设置一个键值。 | Key 属性 |
返回 TextStream 文件中当前的行号。 | Line 属性 |
设置或返回指定文件或者文件夹的名称。 | Name 属性 |
返回指定文件或文件夹上一级文件夹的 folder 对象。 | ParentFolder 属性 |
返回指定文件、文件夹或者驱动器的路径。 | Path 属性 |
返回一个 Folder 对象,该对象代表指定驱动器的根文件夹。 | RootFolder 属性 |
返回用于唯一确定一个磁盘卷的十进制序号。 | SerialNumber 属性 |
返回指定驱动器的网络共享名称。 | ShareName 属性 |
返回程序所使用的需要以前的8.3文件命名约定的短名称。 | ShortName 属性 |
返回程序所使用的需要以前的8.3文件命名约定的短路径。 | ShortPath 属性 |
按字节返回指定文件或文件夹的大小。 | Size 属性 |
返回一个 Folders 集合,该集合包含了指定文件夹中包含的所有文件夹(包括那些具有隐含和系统文件属性设置的文件夹)。 | SubFolders 属性 |
按字节返回驱动器或网络共享的总空间。 | TotalSize 属性 |
返回与文件或文件夹类型有关的信息。 | Type 属性 |
设置或者返回指定驱动器的卷名。 | VolumeName 属性 |

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

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.


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