console 命令行工具 X clear
console
<html>

    <body>
        <div>
            <label for="sendText">发送内容</label>
            <textarea type="" class="uni-textarea-textarea"></textarea>
            <button id="getFous">获取焦点</button>
        </div>
    </body>
	<script>
        document.getElementById('getFous').addEventListener('click', () => {
            document.getElementsByClassName('uni-textarea-textarea')[0].focus()
        })
    </script>
</body>
</html>