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Vue3

It introduces the syntax and common extension plug-ins of vue3 in detail, which is convenient for learning and query. It is full of useful information. Interested friends can refer to it!

Edited at 2024-02-04 00:46:16

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Vue3

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Front-end learning
- 48
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Summary of notes on front-end algorithm network knowledge framework
- 18
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BOM
- 20
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HTML tag types
- 119
- 2
- 1
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HTML CSS
- 357
- 2
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HTML basics
- 26
- 1
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Summary of front-end CSS, JS, and HTML development knowledge points
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CSS front-end HTML basic course training program
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ethers.js
EllaGrace

Create project

vue create A

Template syntax

text

Anywhere

Equivalent to $A.text() in JS

Generally, it is used to set data with data() in js.

Old version

export default { name: '123', data(){ return{ msg: "Message prompt" } } }

new version

ref defines a variable, which can be reassigned using the .value attribute. ref is a repackage of reactive

reactive defines objects, cannot define basic data types, and cannot be reassigned

Raw HTML

When dynamically representing HTML with variables, double curly braces will interpret the data as normal text, not HTML

v-html=""

Equivalent to $A.html() in JS

Attributes

Use variables to dynamically represent attr

v-bind:id=""

Equivalent to $('div').attr('id', 'ID') in JS

v-bind:id can be abbreviated as:id

When we want B in A="B" to be a variable, just add: in front of A.

Simple js expressions can be supported in templates

Can

This is a statement, not an expression

{{ if (ok) {return message} }}

Process control will not take effect, please use ternary expressions

Conditional rendering

v-if

Will only be rendered if the value is true

v-else

v-show

Will render but not display

List rendering

v-for

(x,index) in items

This command will loop len(items) times, and each time the x inside is used to get the value in items

:key="item.id"

Update in place to improve efficiency

event handling

Add event

Write directly

@click="counter = 1"

Call functions

@click="clickHandle(123)"

Old version

methods: { clickHandle(data){ console.log(data); } }

Changing the value of data in methods can be obtained through this.A

new version

You can add a parameter event, which is a native js event.

Notice

click can be triggered on any clicked object, such as <li>

Two-way binding

v-model

Can bidirectionally bind <input>, <textarea>, and <select>

Changing the value in data can change the value in <input>, Changing the value in <input> can also change the value in data

Convert an attribute to a model type

v-model:current-page="nowpage"

v-model.lazy

Will only change when <input> loses focus

v-model.trim

Remove leading and trailing whitespace when retrieving

components

suffix

.vue

content

template

script

export default object properties

name: the name of the component

data: pass data

methods: write functions

components: stores all components used in <template>

props: stores the data passed by the parent component to the child component

watch(): triggered when a certain data changes

computed: dynamically calculate a certain data

setup(props, context): initialize variables and functions

ref defines a variable, which can be reassigned using the .value attribute

Reactive definition object cannot be reassigned

context.emit(): function that triggers parent component binding

return can pass data to child components

style

scoped

If this attribute is present, this style will only take effect in the current component.

load

Introduce components

import A from ./components/A.vue

hanging on component

components:{A}

display component

<A/>

Component interaction

Parent component passed to child component

Pass html

<el-main>List</el-main>

Pass variables

method of delivery

Through props in export default in script

Passing steps

parent component

Write in the tag of the child component in the template

:A=B :C=D

If you want to pass some complex parameter B, you can write it in setup()

Here B is user

Subassembly

script

export default { name : "MyComponent", props: { A:{ type: String, default: "" }, }, }

Generally, choose one of required:true and default:""

Notice

Default values for arrays and objects must be functions

default:function(){ return []; }

default:function(){ return {}; }

In setup, you can reference the information of the parent component through props.

template

{{}} Quote

type passed

String

Number

Boolean

Array

Object

Function

Child component passed to parent component

method of delivery

Pass data through custom events

Passing steps

Subassembly

Write an event A in template

event source

Implement this event A in methods

Old version

this.$emit("B",this.message)

new version

context.emit("B"): function that triggers parent component binding

parent component

Write in the tag of the child component in the template

@B="C"

Implement this event C in methods. The event will have a parameter, which is the passed value.

C(data){}

Component life cycle

When created: beforeCreate, created When rendering: beforeMount, mounted When updating: beforeUpdate, updated When unmounting: beforeUnmount, unmounted

The eight periodic functions are at the same level as data

Introduce third parties

Swiper

carousel

Axios

network request

encapsulation

Create the utils folder in src and create the request.js file in it

Specific usage

https://www.bilibili.com/video/BV1Y84y1B7Tz?p=14&vd_source=048c7bdfe54313b8b3ee1483d9d07e38

10:16

Network request cross-domain solution

querystring

Convert to string

routing

Page jump

Write the URL that needs to be jumped in the routes in the router

<router-view>

show

<router-link to="...">

Jump

Carrying parameters

path:"/list/:A/:B"

to="/list/Baidu/1"

const route = useRoute(); {{route.params.userID}}

Nested routing

Redirect

{ path: '/:catchAll(.*)/', redirect: "/404", }

refresh

The default is to determine whether to refresh by name.

You can customize the judgment method by rewriting the key value

vuex

composition

state: use content in vuex

Getter: Filter and calculate data in Vuex

Mutation: Modify the state in the Vuex store

Old version

new version

import { useStore } from "vuex";

const store = useStore();

setup(){ store.dispatch("login", {paras}) }

Commit is a method for submitting and executing mutations. Mutations modify data and must be synchronized.

Dispatch is a method that submits and executes actions. Actions submit Mutations, which can be asynchronous operations.

action: similar to Mutation, supports asynchronous operations, but cannot modify the store

modules: submodules that define state

transfer

external

state

store.state.user.access

action

store.dispatch("function name", parameters)

mutation

store.commit("function name", parameters)

internal

mutations adjust state

state.id

call function

Change store to context

JWT

Password public key -> new string. If you have the public key, you can use it to verify whether the password is correct. But if you want to get the password through this new string, you need the private key. New string. Push back.

npm i jwt-decode

import jwt_decode from 'jwt-decode';

Note: There is a space after Bearer

ajax

If you want to use ajax on the vue page, you can write it directly in the setup, and it will be called directly when the page is generated. Of course, it can also be written in a function

If you want to use it in vuex, you need to put it in the function to trigger it.

other

setup()

Fragment without root node

Install element

npm install element-plus --save

npm install -D unplugin-vue-components unplugin-auto-import

vue.config.js

const { defineConfig } = require('@vue/cli-service') const AutoImport = require('unplugin-auto-import/webpack') const Components = require('unplugin-vue-components/webpack') const { ElementPlusResolver } = require('unplugin-vue-components/resolvers') module.exports = defineConfig({ transpileDependencies: true, configureWebpack: { plugins: [ AutoImport({ resolvers: [ElementPlusResolver()] }), Components({ resolvers: [ElementPlusResolver()] }) ] } })