Vue3中常见传值方式

Vue3中常见传值方式

Props 方式

<template>
  <!-- 父组件-->
  <Bar :msg="'prop传值'"/>
</template>

<script setup>
  import Bar from './bar.vue'
</script>

------------------------------------
<template>
  <!-- 子组件 -->
  <h1>{{ msg }}</h1>

  <button type="button" @click="count++">
    fei 数量 {{ count }}
  </button>

</template>

<script setup>
  import { ref } from 'vue'
  defineProps({msg: String})
  const count = ref(0)
</script>

Emits 方式

<template>
  <!-- 父组件-->
  <Bar @add="handleFei"/>
</template>

<script setup>
  import Bar from './bar.vue'
  const handleFei = (value) => {
    console.log("接受参数:", value);
  }
</script>

------------------------------------
<template>
  <!-- 子组件 -->
  <button @click="feiClick">点击我触发emits</button>
</template>

<script setup>
  import { defineEmits  } from 'vue'
  const emits = defineEmits(['add'])
  const feiClick = () => {
    emits("add","我是参数,传给父组件")
  }
</script>

DefineExpose 父调子

<template>
  <!-- 父组件-->
  <button @click="feiClick" >点击我触发emits</button>
  <Bar ref="feiRef"/>
</template>

<script setup>
  import Bar from './bar.vue'
  import {ref} from "vue";
  const feiRef = ref(null);
  const feiClick = () => {
    // 调用子组件
    feiRef.value.childrenFei();
  }
</script>

------------------------------------
<template>
  <!-- 子组件 -->
</template>
<script setup>
 const childrenFei = () => {
   console.log("接受父组件方法");
 }
 // 暴露出去方法,让父组件调用
 defineExpose({
   childrenFei
 })
</script>

Provide/Inject 隔代传递

<template>
  <!-- 父组件-->
  <Bar />
</template>

<script setup>
  import Bar from './bar.vue'
  import {provide} from "vue";
  provide('list',"可以隔代传给子组件")
</script>

------------------------------------
<template>
  <!-- 子组件 -->Provide/Inject
  <p>{{fei}}</p>
</template>
<script setup>
  import {inject} from "vue";
  const fei = inject("list")
</script>