Derek Zhu
Package Third-party modules in Node.js are also called packages (just by a different name). Packages are encapsulated based on built-in modules, providing a more advanced and convenient API, which g
Prioritize loading from cache Modules are cached after the first load. This means that multiple calls to require() will not cause the module’s code to be executed multiple times. Whether it is a bui
module object In each .js custom module there is a module object, which stores information about the current module. After printing there is: 1234567891011121314151617Module { id: '.
Modular Concept Modularization refers to the process of dividing the system into several modules layer by layer from top to bottom when solving a complex problem. For the entire system, modules are
http module The http module is officially provided by Node.js and is used to create a web server module. Through the http.createServer() method, you can easily turn an ordinary computer into a Web s
Case Requirements The file that needs to be split is an index.html file with HTML, style, and JS code mixed together. The requirement is to split this mixed file into three files, index.html, index.
path path module The path module is officially provided by Node.js and is used to process paths. It has methods for dealing with paths, such as path.join() to join paths, path.basename() to parse fi
The reason for the problem with the path When using the fs module to operate files, if the provided operation path is relative path starting with ./ or ../, the problem of dynamic path splicing erro
**Write content to the specified file: fs.writeFile() ** 1fs.writeFile(path, data[, options], callback) Parameter 1: Required parameter, string, indicating the path of the file. Parameter 2: Requir
fs filesystem module The fs module is a module for manipulating files and has a series of methods and properties. Such as fs.readFile() fs.writeFile(). Import fs module Before using the fs module
Traverse the object: for…in loops through the object’s own and inherited enumerable properties Loops through the object’s own and inherited enumerable
Promise.all() and Promise.allSettled() Promise.all and Promise.allSettled are both methods for handling multiple concurrent Promises, but they differ
Promise: A new solution for asynchronous programming introduced in ES6. Promises are mainly to solve the previous problem of callback hell. Promise is
render() rerender is used to simulate props changing. How to get rerender(): 1const {rerender} = render(<FavoriteNumber />); rerender(
Format expect(A).ValidateItem() is used in React testing library and Jest to verify functionality. Expect() Assertion Summary 1 [Expect() Assertion Su