vue3自定义v-model

1. v-model='color'不自定义属性名

子组件

props.modelValue
emits("update:modelValue", color.value)

通过defineProps()拿到props
通过defineEmits()拿到emits
通过emit触发更新update:modelValue---- 当使用v-model=时子组件拿到的是属性为modelValue 的值，这是固定的

js 复制代码

<template>
  <label>颜色：<input v-model="color" @input="changeColor" /></label>
</template>
<script setup lang="ts">
import { defineProps, defineEmits, ref } from "vue";

const props = defineProps({
  modelValue: String,
});
const emits = defineEmits<{
  (e: "update:modelValue", value: string): void;
}>();
const color = ref(props.modelValue ?? '')

const changeColor = () => {
  emits("update:modelValue", color.value);
};
</script>
<style></style>

父组件 v-model="color"

js 复制代码

<script setup lang="ts">
import Child from "@/components/child.vue";
import { ref } from "vue";
const color = ref("red");
</script>

<template>
  <Child v-model="color" />
  <div>color:{{ color }}</div>
</template>

2. v-model='color'自定义属性名

子组件

props.color
emits("update:color", color.value)

html 复制代码

1. 通过`defineProps()`拿到props
2. 通过`defineEmits()`拿到emits
3. 通过`emit`触发更新`update:modelValue`---- 当使用`v-model=`时  子组件拿到的是属性为`modelValue`的值，这是固定的
```js
<template>
  <label>颜色：<input v-model="color" @input="changeColor" /></label>
</template>
<script setup lang="ts">
import { defineProps, defineEmits, ref } from "vue";

const props = defineProps({
  color: String,
});
const emits = defineEmits<{
  (e: "update:color", value: string): void;
}>();
const color = ref(props.color ?? '')

const changeColor = () => {
  emits("update:color", color.value);
};
</script>

父组件 v-model:color="color"

html 复制代码

<script setup lang="ts">
import Child from "@/components/child.vue";
import { ref } from "vue";
const color = ref("red");
</script>

<template>
  <Child v-model:color="color" />
  <div>color:{{ color }}</div>
</template>