<div class="main" ref="mainheight" @click="clickChatWords">
        <div class="talkItem" v-for="(item, index) in chatData" :key="index">
            <div classs=’chatWords’>{{item}}</div>
        </div>
    </div>

clickChatWords (e) {
      if (e.target.className === 'chatWords') { // 判断仅当点击类名为‘'chatWords'’的时候触发
// ....
      }
    }