1.通过sync修饰符配合$emit,update实现
父组件:
<template>
<child-view :num.sync="num"></child-view>
</template>
<script>
import childView from './assembly/child'
export default {
components: {childView},
data() {
return {
num: 2
}
}
}
</script>
子组件:
<template>
<div>
<p>父传过来的值:{{num}}</p>
<button @click="changeNum">加一</button>
</div>
</template>
<script>
export default {
name: 'child',
props:{
num: {
type:Number,
default: 0
}
},
methods:{
changeNum(){
this.$emit("update:num",this.num + 1)
}
}
}
</script>
2.通过v-model绑定数据源
父组件:
<template>
<child-view v-modal="num"></child-view>
</template>
<script>
import childView from './assembly/child'
export default {
components: {childView},
data() {
return {
num: 2
}
}
}
</script>
子组件:
<template>
<div>
<p>父传过来的值:{{num}}</p>
<input type="text" :value="value" @input="$emit('input',$event.target.value)">
</div>
</template>
<script>
export default {
name: 'child',
props:["value"]
}
</script>
3.通过父传子,子调用父方法传参数实现
父组件:
<template>
<child-view :num="num" @updateNum="updateNum"></child-view>
</template>
<script>
import childView from './assembly/child'
export default {
components: {childView},
data() {
return {
num: 2
}
},
methods: {
updateNum(num){
this.num = num
}
}
</script>
子组件
<template>
<div>
<p>父传过来的值:{{num}}</p>
<button @click="changeNum">加一</button>
</div>
</template>
<script>
export default {
name: 'child',
props:{
num: {
type:Number,
default: 0
}
},
methods:{
changeNum(){
this.$emit("updateNum",this.num + 1)
}
}
}