vue3组件数据双向绑定

1.双向绑定传递基本数据类型

父组件

<template>
   <div>
      <test v-model="searchText"/>
      <p>父组件值：{{ searchText }}</p>
   </div>
</template>
 
<script setup lang='ts'>
import { ref } from 'vue'
import test from "@/components/test.vue";
const searchText=ref(0)
</script>

子组件(写法一)

<template>
   <div>
     <input type="text" :value="modelValue" @input="emit('update:modelValue',$event.target.value)">
   </div>
</template>
 
<script setup lang='ts'>
const props=defineProps(
  {
    modelValue:{
      type:Number,
      require:true
    }
  }
)
const emit=defineEmits(['update:modelValue'])
</script>

子组件(写法二 绑定到计算属性上)

<template>
   <div>
     <input type="text" v-model="hhh">
   </div>
</template>
 
<script setup lang='ts'>
import { computed } from "vue";
const props=defineProps(
  {
    modelValue:{
      type:Number,
      required:true
    }
  }
)
const emit=defineEmits(['update:modelValue'])

 const hhh=computed({
  get(){
    return props.modelValue
  },
  set(value){
   emit('update:modelValue',value)
  }
})
</script>

2.双向绑定对象
父组件

<template>
   <div>
      <test v-model="obj"/>
      <p>父组件值：{{ obj.name }}</p>
   </div>
</template>
 
<script setup lang='ts'>
import { ref } from 'vue'
import test from "@/components/test.vue";

const obj=ref({
   name:"小明",
   age:28
})
</script>

子组件

<template>
   <div>
     <input type="text" v-model="modelValue.name">
   </div>
</template>
 
<script setup lang='ts'>
const props=defineProps(
  {
    modelValue:{
      type:Object,
      required:true
    }
  }
)
const emit=defineEmits(['update:modelValue'])
</script>