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1. Concept of object In JavaScript, an object is an unordered collection of related attributes and methods. All things are objects, such as strings, values, arrays, functions, etc. Objects are composed of properties and methods Attribute: the characteristic of a thing, which is represented by an attribute in an object (a common noun) Me ...

1. JSON 1.1 What is JSON JSON (JavaScript Object Notation) is a lightweight data exchange format. JSON uses JavaScript syntax to describe data objects, uses a language-independent text format, and is easy to store and exchange. The network media type of JSON is application/json. 1.2 JSON Scope of Use JSON writes data objects based on ...

Realization effect General idea First, I want to judge the number of each question type queried in the interface, find the question type ID whose count is not zero, and it appears first. I won't enter it after query, and then query and render the question resolvent At the beginning, I thought about how to change the activeName of the tabs ...

Scaffold file structure ├── node_modules ├── public │ ├── favicon.ico: Tab Icon │ └── index.html: Main page ├── src │ ├── assets: Storing static resources │ │ └── logo.png │ │── component: Storage components │ │ └── HelloWorld.vue │ │── App.vue: Summarize all components │ │── main.js: Entry file ├── .gitignore: git Configu ...

highlight: a11y-dark theme: scrolls-light Functional programming concepts The essence of the program is to get the output according to the input. X - > F (contact, mapping) - > y, y=f(x). Function is a first-class citizen, which is an ordinary object. It can be used as a parameter of another function, as a return value of a function, a ...

Because the Diff algorithm calculates the difference of virtual DOM, first pave a little bit of virtual DOM, understand its structure, and then uncover the veil of Diff algorithm layer by layer, in simple terms, to help you thoroughly understand the principle of Diff algorithm Understanding virtual DOM Virtual DOM is simply to use JS objects ...

1.Ajax requests obtain more information from the server asynchronously, which means that users can update the latest data of the server without refreshing the web page as long as they trigger an event. 2. Using Ajax, you must call the open() method, which accepts three parameters: the type of request to send (get, post), the URL of the request, ...

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1. What is shallow copy Create a new object that has an exact copy of the original object property values. If the attribute is a basic type, the value of the basic type is copied. If the attribute is a reference type, the memory address is copied  ， So if one object changes this address, it will affect the other object. Above, ` S ...

Homology strategy: What is homology strategy? Homology policy is a requirement (constraint) on network security given by the browser It is agreed that the addresses of the requesting party and the target party must ensure that the domain name and port number of the transmission protocol are completely consistent When you're sending a r ...