   }else if(this.input.from == 'PEM' && this.input.to == 'DER'){
                    if(this.input.pem_cert == null){layer.alert('PEM证书不能为空');return;}
                    data.append('cert', this.input.pem_cert);
                }else if(this.input.from == 'DER' && this.input.to == 'PEM'){
                    if(this.input.der_cert == null){layer.alert('DER证书不能为空');return;}
                    data.append('cert', this.input.der_cert);
                }else if(this.input.from ==