No rules, no rules. JavaScript brings flexibility and uncontrolled variables and access, so it must be restricted with rules. Whether a mature team or a fresh team, the rules should be different. I just listed some common or effective methods to restrain developers who jump. Thinking can make any leap, but the code must continue to be controlled. . Of course, any rules are based on a certain cognitive basis, and the foundation of object-oriented JavaScript is essential, otherwise nothing can be discussed.
Variable and method control:
Module development does not allow the storage of independent global variables and global methods. Only variables and methods are allowed to be placed in the "namespace" of the corresponding module. For an explanation of this, please see this article. It’s really annoying, so how about using anonymous functions?
Java code
(function() {
var value = 'xxx';
var func = function() {...};
})();
Modularization requires strict control of the culture of the code. This It is not only an aspect of code maintainability and customizability, but also allows the JavaScript engine to recycle properties and methods in a timely manner after use.
Polluting native objects in module code is not allowed, such as
Js code
String.prototype.func = new function(){...};
Such code must be controlled centrally, for example, placed uniformly in common.js, Protect it strictly.
Data storage constraints:
Divide and conquer ordinary variables, prototype variables and function variables. Method names must all start with a capital letter. Variable names should still follow the camel nomenclature:
Java code
function T(name){
T.prototype._instance_number++;
this.name = name;
this.showName=function(){
alert(this.name);
}
};
T.prototype = {
_instance_number:0,
getInstanceNum: function(){
return T. prototype._instance_number;
}
};
var t = new T("PortalONE");
t.showName();
new T("Again");
alert(t.getInstanceNum()); // Print: 2
One thing is done intentionally here. The properties and private methods inside T start with an underscore, which implements encapsulation well (if t.instanceNum is used in the above code, this value cannot be accessed), If you don’t understand this code, quickly brush up on the object-oriented nature of JavaScript :). JavaScript provides two methods, closure and prototype, to achieve inheritance and polymorphism. Regarding the application of this in refactoring, I will discuss this in subsequent chapters. In addition, give priority to using JavaScript’s native objects and containers. , such as Array, Ajax data types are unified to JSON, try not to use hidden fields; in addition, it is usually not allowed to expand DOM objects at will.
As for communication between modules: Communication between modules means coupling between modules, which needs to be strictly avoided; communication methods usually use method-level attributes or module-level prototype variables.
DOM manipulation rules:
In module code, it is usually required to separate the manipulation of DOM into module js. You should avoid explicitly writing time-triggered functions on the DOM model, for example:
With the help of JQuery’s series of methods based on bind, after the behavioral logic is separated, you can completely see the refreshing HTML tags.
DOM objects are usually accessed by id, and occasionally by name. Traversing the DOM tree too many times and unreasonably is a taboo in maintaining front-end performance.
CSS style control:
(1) Try to reject the writing style="xxx". The main purpose is to unify the style into the theme style form. Of course, the theme style form is also stored according to modules. For different customizations and differences in different languages Switching styles brings convenience.
(2) Standardize JavaScript’s manipulation of styles. Ideally, a well-encapsulated UI can freely replace its style collection.
The above can only be regarded as the tip of the iceberg. In actual projects, it needs to be gradually refined and improved during the development process.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

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.


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