Programming VIP

1. What is a fs file system module [explanation]: the fs file system module is node JS is an official module for operating files. It provides a series of methods and attributes to meet the basic needs of users for file operation. [basic usage]: Import directly after installing node const fs = require ('fs') 2. Reads the contents of the sp ...

What are server rendering and client rendering 1, Introduction 1.1 server side rendering (SSR) sketch:                            .      when you right-click to view the source code, th ...

1. Calculated attribute It is very convenient to use js expressions in the template. The purpose of the design is only for simple operation. Putting too much logic in the template will make the template too heavy and difficult to maintain. Therefore, for any complex logic, you should use computational properties. <!-- Complex operation --& ...

Functional requirements The company requires novice guidance on its own platform, or cross page and cross routing. I found the novice guidance plug-in on the Internet and finally chose intro JS to use, maybe because it looks a little good, so throw it away. Most of what I write are ideas. If I can understand it, I should be able to easily ...

I array Definition of array 1. Implicit definition Var array name = []; 1 / empty array var array name = [value 1, value 2, value 3...]; 2. Direct instantiation var array name = new array (value 1, value 2, value 3...); 3. Define the array and set the length var array name = new array (size);                      Array operation The subscript o ...

  catalogue Dynamic binding style (supplement to v-bind): Pass class Use the form of variables or expressions     2. Object form  3. Array form Through style 1. Variable or expression 2. Object form 3. Array form Dynamic binding style (supplement to v-bind): Pass class Use the form of variables or expre ...

Symbol 1. Symbol usage let s = Symbol(); console.log(s); Symbol s will never be the same Symbol is a string that will never appear the same. When we declare the same variable, if it occurs repeatedly, only the variable declared for the first time will be printed. let a = Symbol(); let b = Symbol(); console.log(a == b); // false You can' ...

JS Foundation: four inheritance methods in JavaScript & instanceof implementation preface If you don't know much about the prototype chain and type judgment of JS, it is recommended that you first read the following two articles and then come back to understand the principle and purpose of this article Prototype: Prototype Chain Foun ...

The core of realizing bidirectional data binding in vue is v-model Example: <input type="text" name=" " v-model="userName"> When the content in the input box changes, such as the user enters hello world in the view, we will get the value entered by the user in the model layer, that is, where we use js to process the logic code. On the ...

JavaScript process control statement 4.1 definition of statement In ECMAScript, all code is composed of statements. A line of code is a simple statement. In form, it can be a single line statement or a compound statement surrounded by a pair of braces "{}". The compound statement contains several simple statements, which can be trea ...