


Zhang Xiaoxiang JavaScript learning stage summary (2)--(X)HTML learning_basic knowledge
I finished reading Zhang Xiaoxiang's JavaScript-HTML part in the past two days, and summarized the key points of HTML.
When reading these two chapters of HTML, you don’t need to go into details if you encounter something you don’t know. Some are used dynamically, and some are outdated (obsolete usage and syntax).
(1) The HTML version introduced in the book is HTML4.01, which is also the final version of HTML, and XHTML is its subsequent version.
The formulation and specification of the HTML version is carried out by the W3C organization. The website of the W3C organization: www.w3.org
*Related website introduction http://w3china.org/ It is a A Chinese website dedicated to promoting the widespread application of W3C technology. If you are not good at EN, you can go there and have a look. There is a lot of translated information. .
(2) The web page editor used in the book is VS.NET, and readers are recommended to use DW8. In addition, Editplus is also a good code editor. It is currently in version v2.21. There is also a Chinese cracked version online. If you are not good at money or E-text, you can choose it. .
(3) Here is a tag that was rarely used but is now missing a very important tag: Document type tag, syntax:
nbsp;HTML PUBLIC "version name" "url">
It defines in which language the file will be interpreted, it is in this HTML, XHTML and XML are not yet fully unified. Here are two examples:
HTML: nbsp;HTML PUBLIC "-//W3C//DTD HTML 4.01 //EN" "http://www.w3.org/TR/html4/strict.dtd">
Readers should not forcefully memorize the standards. After learning XHTML, they should summarize the rules, eliminate conflicts, and then memorize the tags and syntax. nbsp;HTML PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> For example:
nbsp;html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
etc. . I will publish a summary of the information on HTML and XTHML tags in the BLOG in the next two days. .
(4) The book introduces URL parameters, encoding and references in more detail. This part of the content involves the development of dynamic languages. Web programming must read it. If you only do art, There is no need to understand it. . (The same goes for the subsequent form tags)

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.

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.


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