Vue子传父的三种方法
区别在代码中已标出
1.props方式
父组件内容
<template>
<div class="app">
<h1>{{msg}}</h1>
<!-- : 可替换为 v-bind: -->
<CustomSchool :childEvent="getSchoolName"/>
</div> </template> <script> // 引入子组件 import CustomSchool from '@/components/3Custom/CustomSchool.vue' export default { components: { CustomSchool}, data() { return { msg: '你好啊!' } }, methods:{ getSchoolName(data){ this.msg = data } } } </script>
子组件内容
<template>
<div class="school">
<div>
学校名称:{{name}}</div>
<div>
学校地址:{{address}}
</div>
<button @click="sendSchoolName">把学校名发送给父组件</button>
</div>
</template>
<script>
export default {
props:['childEvent'],
data() { return { name: 'rxy', address: '北京' } }, methods:{ sendSchoolName(){ this.childEvent(this.name)
}
}
}
</script>
2.this.$emit方式(绑定自定义事件)
父组件内容
<template>
<div class="app">
<h1>{{msg}} </h1>
<!-- @ 可替换为 v-on: -->
<CustomSchool @childEvent="getSchoolName"/> </div> </template> <script> import CustomSchool from '@/components/3Custom/CustomSchool.vue' export default { components: { CustomSchool}, data() { return { msg: '你好啊' } }, methods:{ getSchoolName(data){ this.msg = data } } } </script>
子组件内容
<template>
<div class="school">
<div>
学校名称:{{name}}</div>
<div>
学校地址:{{address}}
</div>
<button @click="sendSchoolName">把学校名发送给App</button>
<button @click="unbind">解绑自定义事件</button>
</div> </template> <script> export default { data() { return { name: 'rxy', address: '北京' } }, methods:{ sendSchoolName(){ this.$emit('childEvent',this.name) },
unbind() {
// this.$off('childEvent') //适用于解绑单个事件
// this.$off(['childEvent', 'demo']) //解绑多个自定义事件
this.$off() //解绑所有自定义事件
},
}
}
</script>
3.使用eventBus(更灵活) 例:可用定时器
父组件内容,通过ref方式获取
<template>
<div class="app">
<h1>
{{msg}}
</h1>
<CustomSchool ref="school" />
</div>
</template>
<script>
import CustomSchool from '@/components/3Custom/CustomSchool.vue'
export default {
components: { CustomSchool},
data() {
return {
msg: '你好啊'
}
},
mounted() {
setTimeout(() => {
this.$refs.school.$on('schoolEvent', e => {
this.msg = e
})
}, 3000)
// this.$refs.student.$on('studentEvent',this.getSchoolName) //两种方式都可以
}, methods: {
getSchoolName(data) {
this.msg = data
},
}
}
</script>
子组件内容
<template>
<div class="school">
<div>
学校名称:{{name}}</div>
<div>
学校地址:{{address}}
</div>
<button @click="sendSchoolName">把学校名发送给App</button>
</div>
</template>
<script>
export default {
data() {
return {
name: 'rxy',
address: '北京'
}
},
methods: {
sendSchoolName() {
this.$emit('schoolEvent',this.name)
}
}
}
</script>

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