The module loading and definition part of the project code is as follows:
XX.define('ns',['tool/ cookie'],function(){
});
//or
XX.define('ns.ns2','tool/cookie,tool/abc',function(){
})
//or
XX.define('ns',function(){
})
The js packaging tool used is to scan the file, then match the modules that need to be loaded, and then load the module code first.
The main nodejs packaging tool code is as follows:
//通用模块
var Util = require('util'),
FS = require('fs'),
getDeps = require('./getDeps'),
Uglify = require('./uglify/uglify-js'),
removeBOMChar = require('./removeBOM').removeBOMChar,
PATH =require('path');
var packagedObj = {};//是否已经打包过
module.exports = function(filePath, rootPath, opts){
opts = opts || {};
var str = jscombo(filePath,rootPath);
if(opts.unzip){
return str;
}else{
return Uglify(str);
}
};
function jscombo(filePaths, rootPath){
if(Util.isArray(filePaths)){
return filePaths.map(function(filePath){
filePath = PATH.join(rootPath,filePath);
//只打包一次
if(packagedObj[filePath]){
return '';
}
packagedObj[filePath] = 1;
//是否存在
if(FS.existsSync(filePath)){
//异步读取内容
var str = FS.readFileSync(filePath, 'utf-8');
//移出BOM头
str = removeBOMChar(str);
var result = getDeps(str, rootPath);
var content = result.content;
content = '//' filePath 'n' content;
//递归打包
if(result.list){
return jscombo(result.list, rootPath) content;
}
//返回内容
return content;
}else{
//文件不存在错误信息
console.error('jsCombo Error: ' filePath ' does not exsist! the path is:' rootPath);
return ';alert("' filePath ' does not exsist!");';
}
}).join(';n');
}else{
return jscombo([filePaths],rootPath);
}
}
对于nodejs之前一直没认真学习,都是边查文档,编写的,所以代码很青涩~

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

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.


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