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var bus =new Vue();
    Vue.component("myButton",{
        template:"#my_input",
        data:function(){
            return {
                counter:1,
            }
        },
        methods:{
            updateVal:function(){
                bus.name= ++this.counter;
                bus.$emit("on-message")
            }
        }

    })
    var app=new Vue({
        el:"#app",
        data:{
            "name":"namehere",
        },
        methods:{
        },
        mounted:function(){
            var _this= this;
            bus.$on("on-message",function(){
                _this.name=bus.name;
            })
        }
    })
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@include file="/WEB-INF/webpage/common/taglibs.jspf"%>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>${title}</title>
    <meta name="decorator" content="single"/>
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>


</head>
<body>
<div id="app">
  {{name}}
    <div>
        <my-button></my-button>
    </div>
</div>

<template id="my_input">
    <div @click="updateVal">click div here</div>
</template>

<script>
    var bus =new Vue();
    Vue.component("myButton",{
        template:"#my_input",
        data:function(){
            return {
                counter:1,
            }
        },
        methods:{
            updateVal:function(){
                bus.name= ++this.counter;
                bus.$emit("on-message")
            }
        }

    })
    var app=new Vue({
        el:"#app",
        data:{
            "name":"namehere",
        },
        methods:{
        },
        mounted:function(){
            var _this= this;
            bus.$on("on-message",function(){
                _this.name=bus.name;
            })
        }
    })
</script>
</body>

</html>