vue 父组件传值（Vue两个同级组件传值实现）

<li id='app'>
 <children1></children1>
 <children2></children2>
</li>
<script>
  var children1 = {};
  var children2 = {};
 var vm = new Vue({
  el:'#app',
  components:{
   children1,
   children2
  }
 })
</script>

 <li id='app'>
  <children1></children1>
  <children2></children2>
 </li>
 <script>
     var Event = new Vue({}); // 创建一个vue实例用来作为传值的媒介
   var children1 = {
   template:`
    <li>
     <button @click='send'>点我给children2组件发送数据</button>
    </li>
   `,
   data(){
    return {
     msg:'我是要给children2发送的数据'
    }
   },
   methods:{
    send(){ 
     Event.$emit('go',this.msg) 
    }
   }
  };
   var children2 = {
   template:`
    <li>
     <h2>从children1组件接收到的值：{{msg1}}</h2>  
    </li>
   `,
   data(){
    return{
     msg1:''
    }
   },
   created(){
    Event.$on('go',(v) => { // 必须使用箭头函数因为this
     this.msg1 = v;
    })
   }
  };
  var vm = new Vue({
   el:'#app',
   components:{
    children1,
    children2
   }
  })
</script>