Vue.js子组件向父组件通信的方法实例代码详解

<template>
 <div class='add_item'>
  <label for="username">用户名：
   <input id='username' v-model='username' type="text" name='name'>
  </label>
  <span>username:{{username}}</span>
  <br />
  <input type="radio" value='男' id='male' v-model='picked'>
  <label for="male">男</label>
  <input type="radio" value='女' id='female' v-model='picked'>
  <label for="female">女</label>
  <span>picked:{{picked}}</span>
  <br />
  <button @click='add_user'>新增</button>
 </div>
</template>

<script>
export default {
 name: "itemadd",
 data() {
  return {
   username: "",
   picked: '男'
  }
 },
 methods: {
  add_user() {
  	let user={username:this.username,sex:this.picked}
  	this.$emit('adduser',user)
  }
 }
}
</script>

<style>
.add_item {
 width: 100%;
 background-color: lightblue;
 padding-top: 10px;
 padding-bottom: 10px;
}

.add_item button {
 outline: none;
 border: none;
 width: 200px;
 height: 40px;
 color: white;
 background-color: green;
 border-radius: 10px;
}
</style>

<script>
// 获取组件
import itemAdd from '@/components/itemAdd.vue'

export default {
 name: 'home',
 data() {
  return {
   // 设置初始列表值，为展示效果，特意初始一条数据
   userList: [{
    username: "yang",
    sex: "男"
   }]
  }
 },
 methods: {
  //调用子组件时添加数据到父组件数据
  newuser(user) {
   this.userList.push(user)
  }
 },
 //子组件调用
 components: {
  itemAdd
 }
}
</script>

<template>
 <div class="home">
 	<!-- 子组件调用，并添加时间方法 -->
  <item-add @adduser='newuser'></item-add>
  <ul>
  	<!-- 简单的样式展示 -->
   <li>
    <span>用户名</span>
    &nbsp;&nbsp;&nbsp;&nbsp;
    <span>性别</span>
   </li>
   <li v-for='user in userList' :key='user.id'>
    <span>{{user.username}}</span>
    &nbsp;&nbsp;&nbsp;&nbsp;
    <span>{{user.sex}}</span>
   </li>
  </ul>
 </div>
</template>

<style scoped>
li {
 list-style: none;
}

li:nth-child(even) {
 background-color: lightgrey;
}
</style>