<template>
<center-template :form='userinfo'></center-template>
</template>
<script>
import CenterTemplate from '../../components/admin/userCenterTemplate'
export default {
 components: {
  'center-template': CenterTemplate
 },
 data () {
  return {
   userinfo: {name: 'jack'}
  }
 }, 
}
</script>

...
export default {
  props: {
  // 接收
    form: { userinfo: Object }
    }
  },
}

// 另一种写法
export default {
  props: {
  // 接收
    form: ['userinfo']
    }
  },
}

<template>
  <ul class="letter_city">
    <li @click="selectItem('子组件向父组件传值')">
    </li>
   </ul>
</template>
<script>
export default {
   methods: {
    selectItem(value) {
      this.$emit('selectItems', value)
    }
  }
}
</script>

<template>
  <city-pages @selectItem='selectItem'></city-pages>
</template>
<script>
import cityPages from './cityPages'
export default {
  components: {
    cityPages
  },
  methods: {
    selectItem(value) {
      console.log(value) // 子组件向父组件传值
    }
  }
}
</script>

// common/bus.js

import Vue from 'vue';

// 使用 Event Bus
const bus = new Vue();

export default bus;

import bus from '@/common/bus.js'

export default{
  data(){
    return {
        collapseData: ''   
    }
  },
  created() {
    // 监听collapse，有变动就会收到通知，并改变collapseData值
    bus.$on('collapse', msg => {
      this.collapseData = msg
    })
  }
}

import bus from '@/common/bus.js'

export default {
  methods: {
    sendData(){
      // 发布信号，触发这个函数，其他的接收函数都会收到相应的信息
      bus.$emit('collapse', '信息')
    }
  }
}

import Vue from 'vue'
 import Vuex from 'vuex'
 Vue.use(Vuex);
 const state = {
  message:'Hello World'
 };
 const mutations = {
  newMessage(state,msg){
   state.message = msg
  }
 }
 export default new Vuex.Store({
  state,
  mutations
 })

<template>
 <div>
 <input type="text" @blur=saveName(username) v-model="username">
 </div>
</template>
 
<script type="text/javascript">
 // 引入mapActions，很重要
 import { mapActions } from 'vuex'
 export default {
 data() {
 return {
 username:'',
 password: ''
 }
 },
 methods: {
 ...mapActions({
 // 在input 的blur 事件中触发回调，并将输入值作为参数返回到store中
 saveName: 'saveName'
 })
 }
 }
</script>

<template>
  <div id="list">
    {{_name}}
  </div>
</template>

<script>
import {mapState} from 'vuex'
export default {
  name: 'List',
  data() { return{} },
  computed: {
    // 1普通写法
    // name() { return this.$store.state.name }
    // 2简洁写法
    //...mapState(['name']) 
    // 3重命名
    ...mapState({_name: "name"})
  }
</script>