效果图： 

使用：

<!--main-->
<template>
  <div class="main">
    输入：
    <el-input v-model="inputValue" />
    <el-button @click="analyzeEmoji(inputValue)">显示：</el-button>
    <span v-html="content" />
    <OwO
      ref="ref_owo"
      :emojiWidth="emojiWidth"
      @chooseEmoji="chooseEmoji"
    ></OwO>
  </div>
</template>

<script>
import OwO from "@/components/OwO.vue";
export default {
  components: { OwO },
  data() {
    return {
      inputValue: "",
      content: "",
      emojiWidth: "50%", //写法：400px、50%(默认)
    };
  },
  props: {},
  created() {},
  mounted() {},
  computed: {},
  methods: {
    chooseEmoji(value) {
      this.inputValue += "[" + value + "]";
    },
    analyzeEmoji(value) {
      this.content = this.$refs["ref_owo"].analyzeEmoji(value);
    },
  },
};
</script>

@/components/OwO.vue:

<template>
  <div class="OwO" :style="{ width: emojiWidth }">
    <div class="OwO-body">
      <ul class="OwO-items">
        <li
          class="OwO-item"
          v-for="(oitem, index) in OwOlist"
          :key="index"
          @click="chooseEmoji(oitem.title)"
        >
          <img :src="require('@/assets/img/face/' + oitem.url)" alt />
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
export default {
  components: {},
  data() {
    return {
      OwOlist: [
        //表情包和表情路径
        { title: "微笑", url: "weixiao.gif" },
        { title: "嘻嘻", url: "xixi.gif" },
        { title: "哈哈", url: "haha.gif" },
        { title: "可爱", url: "keai.gif" },
        { title: "可怜", url: "kelian.gif" },
        { title: "挖鼻", url: "wabi.gif" },
        { title: "吃惊", url: "chijing.gif" },
        { title: "害羞", url: "haixiu.gif" },
        { title: "挤眼", url: "jiyan.gif" },
        { title: "闭嘴", url: "bizui.gif" },
        { title: "鄙视", url: "bishi.gif" },
        { title: "爱你", url: "aini.gif" },
        { title: "泪", url: "lei.gif" },
        { title: "偷笑", url: "touxiao.gif" },
        { title: "亲亲", url: "qinqin.gif" },
        { title: "生病", url: "shengbing.gif" },
        { title: "太开心", url: "taikaixin.gif" },
        { title: "白眼", url: "baiyan.gif" },
        { title: "右哼哼", url: "youhengheng.gif" },
        { title: "左哼哼", url: "zuohengheng.gif" },
        { title: "嘘", url: "xu.gif" },
        { title: "衰", url: "shuai.gif" },
        { title: "吐", url: "tu.gif" },
        { title: "哈欠", url: "haqian.gif" },
        { title: "抱抱", url: "baobao.gif" },
        { title: "怒", url: "nu.gif" },
        { title: "疑问", url: "yiwen.gif" },
        { title: "馋嘴", url: "chanzui.gif" },
        { title: "拜拜", url: "baibai.gif" },
        { title: "思考", url: "sikao.gif" },
        { title: "汗", url: "han.gif" },
        { title: "困", url: "kun.gif" },
        { title: "睡", url: "shui.gif" },
        { title: "钱", url: "qian.gif" },
        { title: "失望", url: "shiwang.gif" },
        { title: "酷", url: "ku.gif" },
        { title: "色", url: "se.gif" },
        { title: "哼", url: "heng.gif" },
        { title: "鼓掌", url: "guzhang.gif" },
        { title: "晕", url: "yun.gif" },
        { title: "悲伤", url: "beishang.gif" },
        { title: "抓狂", url: "zhuakuang.gif" },
        { title: "黑线", url: "heixian.gif" },
        { title: "阴险", url: "yinxian.gif" },
        { title: "怒骂", url: "numa.gif" },
        { title: "互粉", url: "hufen.gif" },
        { title: "书呆子", url: "shudaizi.gif" },
        { title: "愤怒", url: "fennu.gif" },
        { title: "感冒", url: "ganmao.gif" },
        { title: "心", url: "xin.gif" },
        { title: "伤心", url: "shangxin.gif" },
        { title: "猪", url: "zhu.gif" },
        { title: "熊猫", url: "xiongmao.gif" },
        { title: "兔子", url: "tuzi.gif" },
        { title: "喔克", url: "ok.gif" },
        { title: "耶", url: "ye.gif" },
        { title: "棒棒", url: "good.gif" },
        { title: "不", url: "no.gif" },
        { title: "赞", url: "zan.gif" },
        { title: "来", url: "lai.gif" },
        { title: "弱", url: "ruo.gif" },
        { title: "草泥马", url: "caonima.gif" },
        { title: "神马", url: "shenma.gif" },
        { title: "囧", url: "jiong.gif" },
        { title: "浮云", url: "fuyun.gif" },
        { title: "给力", url: "geili.gif" },
        { title: "围观", url: "weiguan.gif" },
        { title: "威武", url: "weiwu.gif" },
        { title: "话筒", url: "huatong.gif" },
        { title: "蜡烛", url: "lazhu.gif" },
        { title: "蛋糕", url: "dangao.gif" },
        { title: "发红包", url: "fahongbao.gif" },
      ],
    };
  },
  props: {
    emojiWidth: {
      type: String,
      default: "50%",
    },
  },
  created() {},
  mounted() {},
  computed: {},
  methods: {
    //选择表情包
    chooseEmoji: function (content) {
      this.$emit("chooseEmoji", content);
    },
    analyzeEmoji: function (cont) {
      //编译表情替换成图片展示出来
      var pattern1 = /\[[\u4e00-\u9fa5]+\]/g;
      var pattern2 = /\[[\u4e00-\u9fa5]+\]/;
      var content = cont.match(pattern1);
      var str = cont;
      if (content) {
        for (var i = 0; i < content.length; i++) {
          for (var j = 0; j < this.OwOlist.length; j++) {
            if ("[" + this.OwOlist[j].title + "]" == content[i]) {
              var src = this.OwOlist[j].url;
              break;
            }
          }
          var s = require("@/assets/img/face/" + src);
          var imoj = "<img src='" + s + "'/>";

          str = str.replace(pattern2, imoj);
        }
      }
      return str;
    },
  },
};
</script>

<style lang="scss" scoped>
.OwO {
  position: relative;
  z-index: 1;
  color: black;
  .OwO-body {
    position: absolute;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 0 4px 4px 4px;

    .OwO-items {
      max-height: 197px;
      overflow-y: scroll;
      padding: 10px;
      .OwO-item {
        background: #f7f7f7;
        padding: 5px 10px;
        border-radius: 5px;
        display: inline-block;
        margin: 0 10px 12px 0;
        transition: 0.3s;
        line-height: 19px;
        font-size: 20px;
        cursor: pointer;
        &:hover {
          background: #eee;
          box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14),
            0 3px 1px -2px rgba(0, 0, 0, 0.2), 0 1px 5px 0 rgba(0, 0, 0, 0.12);
        }
      }
    }
  }
}
</style>