Vue 2中ref属性的使用方法及注意事项

// html<ul>　　<li ref="refCon">1</li>　　<li ref="refCon">2</li></ul>// jscreated: 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>

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

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