Notes on using $refs in Vue instances

...
<el-table v-if="flag" ref="table">
  <el-table-column prop="prop1"></el-table-column>
  <el-table-column prop="prop2"></el-table-column>
</el-table>
...
 
 
export default {
  methods: {
    this.$refs.table.XXX()
  }
}

<div id="ref-outside-component" v-on:click="consoleRef">
  <component-father ref="outsideComponentRef">
  </component-father>
  <p>ref is on the outer component</p>
</div>

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

<!--ref is on the outer element-->
<div id="ref-outside-dom" v-on:click="consoleRef" >
  <component-father>
  </component-father>
  <p ref="outsideDomRef">ref is on the outside element</p>
</div>

var refoutsidedomTem = {
    template:"<div class='childComp'><h5>I am a child component</h5></div>"
  };
  var refoutsidedom = new Vue({
    el:"#ref-outside-dom",
    components:{
      "component-father":refoutsidedomTem
    },
    methods:{
      consoleRef:function () {
        console.log(this); // #ref-outside-dom vue example console.log(this.$refs.outsideDomRef); // <p> ref is on the outside element</p>
      }
    }
  });

<!--ref on the element inside-->
<div id="ref-inside-dom">
  <component-father>
  </component-father>
  <p>ref is on the element inside</p>
</div>

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

<!--ref on the element inside--global registration-->
<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 on the element inside--globally registered</p> " +
         "</div>",
    methods:{
      showinsideDomRef:function () {
        console.log(this); //This is actually div.insideFather
        console.log(this.$refs.insideDomRefAll); // <input type="text">
      }
    }
  });
  var refinsidedomall = new Vue({
    el:"#ref-inside-dom-all"
  });

    console.log('outside this.$refs.imgLocal2', this.$refs.imgLocal2);
    setTimeout(() => {
     console.log('this.$refs.imgLocal2 setTimeout', this.$refs.imgLocal2);
    }, 500); // Not recommended this.$nextTick(() => {
     console.log('this.$refs.imgLocal2 $nextTick', this.$refs.imgLocal2);
    });