v class="custom-file">
                        <input type="file" class="custom-file-input" id="customFile2" accept=".pem,.crt,.cer" required @change="handleFile('pem_mycert', event)">
                        <label class="custom-file-label" for="customFile2">点击选择文件</label>
                    </div>
                </div>
            </div>
            <div class="form-group" v-show="input.from=='PEM'&&input.to!='DER'">
                <label class="form-label" for="customFileLabel">PEM 