// html
<ul>
　　<li ref="refCon">1</li>
　　<li ref="refCon">2</li>
</ul>
// js
created: function() {
　　this.$nextTick(() => {
　　　　console.log(this.$refs.refCon) 
　　　　// 打印结果：<li>2</li> 本以为会获得一个数组
　　 })
}

// html
<ul>
 <li v-for="item in people" ref="refContent">{{item}}</li>
</ul>

// js
data: {
 people:['三姑','四婶','五叔','六姨','七舅姥爷']
},
created: function() {
 this.$nextTick(() => {
  console.log(this.$refs.refContent)
 })
}

// js
data: {
 people:['三姑','四婶','五叔','六姨','七舅姥爷']
},
created: function() {
 console.log(this.$refs.refContent)
 // undefined
}