Vue实现父子组件传值其实不难

<template>
  <Child title="dataToChild" />
</template>
<script>
import Child from './child' //引入子组件
export default{
  components: { Child },
  data () {
    return {
      dataToChild: 'From Parent to Child'
    }
  }
}
</script>

props:[ 'data1', 'data2' ]

props:{ 
  data1:{
    type: String, 
    default: 'no data'
  },
  data2:{
    type: Number, 
    default: 0，
    required: true
  }
}

<template>
  <div class="children">
    <div>来自父组件的值是：{{title}}</div>
  </div>
</template>

<script>
export default {
  props: {
    title: {
      type: String, //接收值得类型
      default: '父组件没传值' //配置默认值
    }
  },
  //或者可以写成简单数组 props: ['title'],
  data () {
    return {}
  }
}
</script>

<template>
  <div class="parent">
    <Child @child="getChildData" />
    <p>子组件传给父组件的值：{{dataFromChild}}</p>
  </div>
</template>

<script>
import Child from './Child'
export default {
  components: { Child },
  data () {
    return {
      dataFromChild: ''
    }
  },
  methods: {
  	/* 自定义事件 */
    getChildData (param) {
      this.dataFromChild = param
    }
  }
}
</script>

<template>
  <div class="child-parent">
    <input type="text" v-model="toParent" />
    <button @click="dataToParent">传值到父组件</button>
  </div>
</template>

<script>
export default {
  data () {
    return {
      toParent: 'From Child to Parent'
    }
  },
  methods: {
    dataToParent () {
      this.$emit('child', this.toParent)
    }
  }
}
</script>