新增一個POPCover
<div class="send-block">
<div class="tool-bar">
<el-popover
placement="top-start"
title="選擇表情符號"
width="200"
trigger="click"
content="☹️☹️☹️☹️☹️">
<span class="emoji-button" slot="reference" circle size="small">?</span>
</el-popover>
</div>
<textarea class="input" @keyup.enter="sendMessage" v-model="newMessage">
</textarea>
</div>
插入所選中的Emoji