vue 组件之间的传值

父向子传值
父组件

 <v-footer :projectdat="dat"></v-footer> 

export default {
        data() {
            return {
                dat: 'hahah', 

            }
        }
}

子组件：

export default {
        data() {
            return {
                code: localStorage.getItem('orgcode'),
                id: this.$route.params.id,
            }
        },
        props: ['projectdat']
}

子向父传值
父组件这么写

<component-a  v-on:child-say="listenToMyBoy"></component-a>

<p>Do you like me? {{childWords}}</p>

 methods: {

            listenToMyBoy: function (somedata){

              this.childWords = somedata

            }

        }

子组件component-a这么写

<button v-on:click="onClickMe">like!</button>

methods: {

      onClickMe: function(){

        this.$emit('child-say',this.somedata);

      }