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Constant symbolization:   Use symbols instead of specific numbers to represent numbers in programsconst int a=12;               const fixes a to a value of 12 Enumeration: Enumeration is a user-defined data type that is declared with the keyword enum in the following syntax:enum enumeration type name {nam ...

preface The purpose of writing this series of articles on JavaScript simple meal is to record various knowledge points when reading and learning the book JavaScript advanced programming (4th Edition). Although it is a note and summary of reading, I hope it is light, concise and sharp, will not cause reading fatigue, and can take a light ...

Take you to understand JavaScript from zero to essence (V) JavaScript branch statements 1, What are JavaScript statements Expressions are phrases in JavaScript. A newline phrase or a semicolon ending phrase is a line of statements. A command issued by a JavaScript statement to a browser. Statement tells the browser what to do. Statements usua ...

Promise object, solve callback hell, and execute code synchronously This article records the knowledge points studied BY: Lin Yi preface: Asynchronous operation is an advantage of JS and brings great trouble. There is a word called callback hell, that is, in a callback function, execute another asynchronous task and nest it all the time, res ...

Variable scope memory The es variable has two different types of data: original value and reference value Original values: undefined, null, boolean, number, string, symbol The variable that holds the original value is accessed by value Reference value: an object stored in memory. It is an object composed of multiple values. JavaScript cannot d ...

There are a lot of discussions on this topic on the Internet. I sorted it out myself according to various situations. Finally, I can approach the perfect realization of deep copy. Welcome to discuss. Objects in javascript are reference types. When copying objects, you should consider whether to use shallow copy or deep copy. Direct assignment ...

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Deconstruction assignment syntax is a JavaScript expression. By deconstruction assignment, you can take the attribute / value from the object / array and assign it to other variables. This syntax is a new syntax introduced by ECMAscript 6 specification, which makes it easier to get values from arrays and objects. 1. Extract data Let's tak ...

Type conversion is divided into two types: forced type conversion and implicit type conversion Cast type Forced type conversion mainly refers to three functions: Number(), String(), and Boolean. Manually convert various types of values into numbers, strings, or boolean values Number() There are two main types: one is that the parameter is t ...

In this article, you can learn: Implement your own Vue routerLearn what Vue plug-ins are Learning the notes made by the boss of station b and the implementation of the source code 1.1.3 take you step by step to understand the core principle and implementation of Vue router_ Beep beep beep_ bilibili Use the official Vue router Initialize ...