


Summary of several attributes that DOM2 is non-standard but supports very well_DOM
offsetWidth: refers to the space occupied by the element in the horizontal direction, including the width of the border and scroll bar
offsetHeight: refers to the vertical direction of the element The amount of space occupied by the element, including the height of the border and scroll bar
offsetLeft: Returns the left offset of the element, that is, the pixel distance from the left outer border of the element to the left inner border of the containing element
offsetTop: Returns the element's left offset Top offset, that is, the pixel distance from the top outer border of the element to the top inner border of the containing element
offsetParent: Returns the index of the nearest dynamically positioned containing element, that is, the ancestor element of the element
2. Client area size
clientWidth: refers to the space occupied by the element content (including padding) in the horizontal direction, excluding the width of the border and scroll bar
clientHeight : Refers to the space occupied by the element content (including padding) in the vertical direction, excluding the height of the border and scroll bar
3. Scroll size
scrollWidth: refers to the actual width of the element content (including padding), including the hidden content width
scrollHeight: refers to the actual height of the element content (including padding), including the hidden content height
scrollLeft: refers to the width of the hidden content on the left side of the element
scrollTop: refers to the height of the hidden content above the element

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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