Introduction to the use of special symbols in URL_javascript skills
URL is the Uniform Resource Locator, which is a type of universal resource identifier URI.
Since a valid URI cannot contain certain characters, such as spaces, etc., if the URI is not encoded using the corresponding encoding function (the browser will process the corresponding URL), then valid resources cannot be accessed. .
There are four URI methods in JavaScript's Global object (javascript's built-in object), namely encodeURI and decodeURI, encodeURIComponent and decodeURIComponent. The browser model (BOM) provides escape and unescape. In practical applications, the URI method is preferable because the URI method encodes all Unicode symbols, while the escape and unescape provided by BOM only encode ASCII symbols. In addition, escape and unescape can be used to encrypt and decrypt data.
Among them, encodeURI and decodeURI are processed in opposite ways, encodeURIComponent and decodeURIComponent are processed in opposite ways, and escape and unescape are processed in opposite ways.
encodeURI handles the complete URI, while encodeURIComponent handles the URI fragment, encodeURI encoding except:! ,#,¥,&,',(,),×, ,,,-,.,/,:,;,=,? , characters other than @, _, ~, 0-9, a-z, A-Z (82 in total), while encodeURIComponent encodes characters other than: !, ', (,), *, -, ., _, ~, 0-9, Characters other than a-z, A-Z (71 in total), escape encodes characters other than: *, , -, ., /, @, _, 0-9, a-z, A-Zs (61 in total).
When requesting a file with a name containing special characters ( ) from the server (the server is a 64-bit operating system), using encodeURI, decodeURIComponent or escape will prompt that the corresponding resource does not exist. Why is this?
js code:
url =" http://192.168.6.135/nas135/MyDocument/1 2.txt"
window.open(EncodeURI(url),"","","");
via debug I saw
EncodeURI(url)="http://192.168.6.135/nas135/MyDocument/1+2.txt", but I can’t open the file 1 2.txt on the server side. I don’t know if it’s because of 64 The reason for the machine? Could you guys please help explain?

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

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.


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