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🙇 preface In the twinkling of an eye, it's the Spring Festival again, and this year's Spring Festival is just my life year 🐯. Because of the epidemic, I may not be able to go home for the new year again. I still want to go back to see the fireworks and feel the flavor of the next year 🧧. Since you can't go back, make one by yourself ~ enjo ...

Keep alive component is a component provided by Vue. It can cache component instances and avoid component mounting and unloading in some cases. It is very practical in some scenarios. For example, we recently encountered a scenario in which a component uploads a large file is a time-consuming operation. If you switch to other page contents dur ...

Get started quickly a. Install express, currently using version 4.17. Enter the following command in the terminal: yarn add express b. Create an 'app JS' file, introduce express, create an Express instance, and listen to port 3000. //app.js const express = require('express'); const app = express(); app.listen(3000, () => { console. ...

preface Vue framework has been used for more than two years. I found that I don't have a deep understanding of Vue, and I only stay where I can use Vue. I don't know much about some details. I recently watched the open class of Lubai at station b. combined with the understanding of the source code of Vue official website, I plan to imitate ...

1, Regular expression 1. Regular expression overview Regular Expression is a pattern used to match the composition of characters in a string. It is used to detect whether the composition of a string meets certain requirements or rules. It is usually used to verify the form: for example, to verify that the user name can only be composed of Eng ...

catalogue 1, Data types in JS 2, Methods of judging data types in JS 1. Using typeof 2. Using instanceof 3. Use object prototype. toString. call 4. Using constructor 1, Data types in JS ECMAScript has five simple data types (also known as basic data types): Undefined, Null, Boolean, Number, and String. There is also the complex data ...

The common primitive types of ECMAScript are String type. We can declare a String directly through literal quantity var str = 'hello world!' str.length //12 str.charAt(2) //l The original type of data itself is not an object, so there should be no properties and methods, but the original value of String type can refer to some methods It can ...

The height of textarea is self-adaptive, the height of textarea is automatically increased, and the height of textarea is automatically extended. In this paper, by copying the height of textarea html For another element, pre is set to expand automatically, so there will be no feeling of detention, and the interaction effect is good.   technol ...

1. Convert degrees Celsius to degrees FahrenheitThe conversion from Celsius to Fahrenheit is calculated by multiplying Celsius by 9 / 5 and then adding 32Input: convertToF(0) should return a numberInput: - 30Output: - 22Where celsius stands for celsius and fahrenheit for fahrenheitSolution:function convertToF(celsius) { let fahrenheit; fahr ...

The front end of Xiaogao's not quite walking – Vue preface In this chapter, we will learn Vue's template syntax, Vue's conditional statements, and Vue's circular statements. What you need to know before reading this tutorial: HTML CSS JavaScript This tutorial mainly introduces vue3 Use of version X. 1, Vue templ ...