<div id="ref-outside-component" v-on:click="consoleRef">
 <component-father ref="outsideComponentRef">
 </component-father>
 <p>ref在外面的組件上</p>
</div>

 var refoutsidecomponentTem={
 template:"<div class='childComp'><h5>我是子組件</h5></div>"
 };
 var refoutsidecomponent=new Vue({
 el:"#ref-outside-component",
 components:{
 "component-father":refoutsidecomponentTem
 },
 methods:{
 consoleRef:function () {
 console.log(this); // #ref-outside-component vue實例
 console.log(this.$refs.outsideComponentRef); // div.childComp vue實例
 }
 }
 });

<!--ref在外面的元素上-->
<div id="ref-outside-dom" v-on:click="consoleRef" >
 <component-father>
 </component-father>
 <p ref="outsideDomRef">ref在外面的元素上</p>
</div>

 var refoutsidedomTem={
 template:"<div class='childComp'><h5>我是子組件</h5></div>"
 };
 var refoutsidedom=new Vue({
 el:"#ref-outside-dom",
 components:{
 "component-father":refoutsidedomTem
 },
 methods:{
 consoleRef:function () {
 console.log(this); // #ref-outside-dom vue實例
 console.log(this.$refs.outsideDomRef); // <p> ref在外面的元素上</p>
 }
 }
 });

<!--ref在里面的元素上-->
<div id="ref-inside-dom">
 <component-father>
 </component-father>
 <p>ref在里面的元素上</p>
</div>

 var refinsidedomTem={
 template:"<div class='childComp' v-on:click='consoleRef'>" +
 "<h5 ref='insideDomRef'>我是子組件</h5>" +
 "</div>",
 methods:{
 consoleRef:function () {
 console.log(this); // div.childComp vue實例 
 console.log(this.$refs.insideDomRef); // <h5 >我是子組件</h5>
 }
 }
 };
 var refinsidedom=new Vue({
 el:"#ref-inside-dom",
 components:{
 "component-father":refinsidedomTem
 }
 });

<!--ref在里面的元素上--全局注冊-->
<div id="ref-inside-dom-all">
 <ref-inside-dom-quanjv></ref-inside-dom-quanjv>
</div>

 Vue.component("ref-inside-dom-quanjv",{
 template:"<div class='insideFather'> " +
 "<input type='text' ref='insideDomRefAll' v-on:input='showinsideDomRef'>" +
 " <p>ref在里面的元素上--全局注冊 </p> " +
 "</div>",
 methods:{
 showinsideDomRef:function () {
 console.log(this); //這里的this其實還是div.insideFather
 console.log(this.$refs.insideDomRefAll); // <input type="text">
 }
 }
 });

 var refinsidedomall=new Vue({
 el:"#ref-inside-dom-all"
 });