oup">
                <label class="form-label" for=input">字符串</label>
                <div class="form-control-wrap">
                    <textarea class="form-control" id="input" rows="8" placeholder="需要编码/解码的字符串"></textarea>
                </div>
            </div>
            <div class="row pt-1 pb-1">
                <div class="col-3">
                    <button class="btn btn-dim btn-outline-secondary btn-block card-link" onclick="encode()">
                     