Vue3自动引入插件
unplugin-auto-import/vite
vite配置
import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
import VueJsx from '@vitejs/plugin-vue-jsx'
import AutoImport from 'unplugin-auto-import/vite'
// https://vitejs.dev/config/
export default defineConfig({
plugins: [vue(),VueJsx(),AutoImport({
imports:['vue'],
dts:"src/auto-import.d.ts"
})]
})
配置完成之后使用ref reactive watch 等 无须import 导入 可以直接使用
v-model
在Vue3 v-model 是破坏性更新的
v-model在组件里面也是很重要的
v-model 其实是一个语法糖 通过props 和 emit组合而成的
默认值的改变
- prop:value -> modelValue
- 事件:input -> update:modelValue
- v-bind 的 .sync 修饰符和组件的 model 选项已移除
- 新增 支持多个v-model
- 新增 支持自定义 修饰符
案例:
子组件
<template>
<div v-if='propData.modelValue' class="dialog">
<div class="dialog-header">
<div>标题</div><div @click="close">x</div>
</div>
<div class="dialog-content">
内容
</div>
</div>
</template>
<script setup lang='ts'>
type Props = {
modelValue:boolean
}
const propData = defineProps<Props>()
const emit = defineEmits(['update:modelValue'])
const close = () => {
emit('update:modelValue',false)
}
</script>
<style lang='less'>
.dialog{
width: 300px;
height: 300px;
border: 1px solid #ccc;
position: fixed;
left:50%;
top:50%;
transform: translate(-50%,-50%);
&-header{
border-bottom: 1px solid #ccc;
display: flex;
justify-content: space-between;
padding: 10px;
}
&-content{
padding: 10px;
}
}
</style>
父组件
<template>
<button @click="show = !show">开关{{show}}</button>
<Dialog v-model="show"></Dialog>
</template>
<script setup lang='ts'>
import Dialog from "./components/Dialog/index.vue";
import {ref} from 'vue'
const show = ref(false)
</script>
<style>
</style>
绑定多个案例:
子组件
<template>
<div v-if='modelValue ' class="dialog">
<div class="dialog-header">
<div>标题---{{title}}</div><div @click="close">x</div>
</div>
<div class="dialog-content">
内容
</div>
</div>
</template>
<script setup lang='ts'>
type Props = {
modelValue:boolean,
title:string
}
const propData = defineProps<Props>()
const emit = defineEmits(['update:modelValue','update:title'])
const close = () => {
emit('update:modelValue',false)
emit('update:title','我要改变')
}
</script>
<style lang='less'>
.dialog{
width: 300px;
height: 300px;
border: 1px solid #ccc;
position: fixed;
left:50%;
top:50%;
transform: translate(-50%,-50%);
&-header{
border-bottom: 1px solid #ccc;
display: flex;
justify-content: space-between;
padding: 10px;
}
&-content{
padding: 10px;
}
}
</style>
父组件
<template>
<button @click="show = !show">开关{{show}} ----- {{title}}</button>
<Dialog v-model:title='title' v-model="show"></Dialog>
</template>
<script setup lang='ts'>
import Dialog from "./components/Dialog/index.vue";
import {ref} from 'vue'
const show = ref(false)
const title = ref('我是标题')
</script>
<style>
</style>
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