Vue2
父传子
父组件:
<!-- 父组件 -->
<template>
<div>
<children :title="title"></children>
</div>
</template>
<script>
import children from "./children.vue"
export default {
components: {
children
},
data() {
return {
title: "我是父组件传过来的值",
}
}
}
</script>
子组件:
<!-- 子组件 -->
<template>
<div>
<div>父组件传过来的值: {
{
title }}</div>
</div>
</template>
<script>
export default {
props: {
title: {
type: String
}
}
}
</script>
子传父
父组件:
<!-- 父组件 -->
<template>
<div>
<children @getChildren="getChildren"></children>
</div>
</template>
<script>
import children from "./children.vue"
export default {
methods: {
getChildren(val) {
this.childrenAsk = val
}
}
}
</script>
子组件:
<!-- 子组件 -->
<template>
<div>
<button @click="askToFather">点击发送给父组件</button>
</div>
</template>
<script>
export default {
props: {
title: {
type: String
}
},
data() {
return {
askMsg: "这是我给父组件说的话"
}
},
methods: {
askToFather() {
this.$emit("getChildren", this.askMsg)
}
}
}
</script>
Vue3
父传子
同 Vue2
子传父
父组件:
<template>
<children @listen="listenToChildren"></children>
</template>
<script>
export default defineComponent({
components: {
children,
},
name: "father",
setup() {
let children_msg = ref("") // ref的作用是实现响应式, 如果没有ref则不能实现响应式(引用数据类型用reactive)
let listenToChildren = (val) => {
children_msg.value = val // 使用ref包裹的数据,需要通过.value的形式访问他的值
}
return {
children_msg,
listenToChildren,
}
},
})
</script>
子组件:
<template>
<button @click="sayToFather">向父组件说话</button>
</template>
<script>
export default defineComponent({
name: "children",
setup(props, context) {
// context作用是获取上下文对象,
// 如果setup写法为setup(props, { emit })的方式的话,下面的context可以省略
const sayToFather = () => {
const ask = "我是子组件,我对父组件说话"
context.emit("listen", ask)
}
return {
sayToFather,
}
},
})
</script>