VUE3全家桶精讲

<script>
export default {
  data(){
    return {
      count:0
    }
  },
  methods:{
    addCount(){
      this.count++
    }
  }
}
</script>

<script setup>
import { ref } from 'vue'
const count = ref(0)
const addCount = ()=> count.value++
</script>

npm init vue@latest

<script>
  export default {
    setup(){
    },
    beforeCreate(){
    }
  }
</script>

<script>
  export default {
    setup(){
      const message = 'this is message'
      const logMessage = ()=>{
        console.log(message)
      }
      // 必须return才可以
      return {
        message,
        logMessage
      }
    }
  }
</script>

<script setup>
  const message = 'this is message'
  const logMessage = ()=>{
    console.log(message)
  }
</script>

<script setup>
 // 导入
 import { reactive } from 'vue'
 // 执行函数 传入参数 变量接收
 const state = reactive({
   msg:'this is msg'
 })
 const setSate = ()=>{
   // 修改数据更新视图
   state.msg = 'this is new msg'
 }
</script>
<template>
  {{ state.msg }}
  <button @click="setState">change msg</button>
</template>

<script setup>
 // 导入
 import { ref } from 'vue'
 // 执行函数 传入参数 变量接收
 const count = ref(0)
 const setCount = ()=>{
   // 修改数据更新视图必须加上.value
   count.value++
 }
</script>
<template>
  <button @click="setCount">{{count}}</button>
</template>

<script setup>
// 导入
import {ref, computed } from 'vue'
// 原始数据
const count = ref(0)
// 计算属性
const doubleCount = computed(()=>count.value * 2)
// 原始数据
const list = ref([1,2,3,4,5,6,7,8])
// 计算属性list
const filterList = computed(item=>item > 2)
</script>

<script setup>
  // 1. 导入watch
  import { ref, watch } from 'vue'
  const count = ref(0)
  // 2. 调用watch 侦听变化
  watch(count, (newValue, oldValue)=>{
    console.log(`count发生了变化，老值为${oldValue},新值为${newValue}`)
  })
</script>

<script setup>
  // 1. 导入watch
  import { ref, watch } from 'vue'
  const count = ref(0)
  const name = ref('cp')
  // 2. 调用watch 侦听变化
  watch([count, name], ([newCount, newName],[oldCount,oldName])=>{
    console.log(`count或者name变化了，[newCount, newName],[oldCount,oldName])
  })
</script>

<script setup>
  // 1. 导入watch
  import { ref, watch } from 'vue'
  const count = ref(0)
  // 2. 调用watch 侦听变化
  watch(count, (newValue, oldValue)=>{
    console.log(`count发生了变化，老值为${oldValue},新值为${newValue}`)
  },{
    immediate: true
  })
</script>

<script setup>
  // 1. 导入watch
  import { ref, watch } from 'vue'
  const state = ref({ count: 0 })
  // 2. 监听对象state
  watch(state, ()=>{
    console.log('数据变化了')
  })
  const changeStateByCount = ()=>{
    // 直接修改不会引发回调执行
    state.value.count++
  }
</script>
<script setup>
  // 1. 导入watch
  import { ref, watch } from 'vue'
  const state = ref({ count: 0 })
  // 2. 监听对象state 并开启deep
  watch(state, ()=>{
    console.log('数据变化了')
  },{deep:true})
  const changeStateByCount = ()=>{
    // 此时修改可以触发回调
    state.value.count++
  }
</script>

<scirpt setup>
import { onMounted } from 'vue'
onMounted(()=>{
  // 自定义逻辑
})
</script>

<scirpt setup>
import { onMounted } from 'vue'
onMounted(()=>{
  // 自定义逻辑
})
onMounted(()=>{
  // 自定义逻辑
})
</script>

import { fileURLToPath, URL } from 'node:url'
import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    vue({
      script: {
        defineModel: true
      }
    }),
  ],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url))
    }
  }
})

npm init vite@latest

npm i pinia-plugin-persistedstate

import persist from 'pinia-plugin-persistedstate'
...
app.use(createPinia().use(persist))

import { defineStore } from 'pinia'
import { computed, ref } from 'vue'
export const useCounterStore = defineStore('counter', () => {
  ...
  return {
    count,
    doubleCount,
    increment
  }
}, {
  persist: true
})