添加条形码内容

This commit is contained in:
dxc
2026-02-02 15:06:20 +08:00
parent a1133aac94
commit cf6a4a8957
11 changed files with 449 additions and 34 deletions

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@ -20,7 +20,9 @@ def create_app():
# 2. 注册蓝图 (Blueprints)
# =========================================================
# 注册入库聚合模块 (Inbound)
# -----------------------------------------------------
# 2.1 注册入库聚合模块 (Inbound)
# -----------------------------------------------------
try:
# 指向聚合文件: app/api/v1/inbound/__init__.py
# 该文件里应该包含了 buy, semi, base, product 的聚合逻辑
@ -29,9 +31,6 @@ def create_app():
# 注册父蓝图,路由前缀为 /api/v1/inbound
# 最终路由效果:
# /api/v1/inbound + /buy/list -> /api/v1/inbound/buy/list
# /api/v1/inbound + /semi/list -> /api/v1/inbound/semi/list
# /api/v1/inbound + /product/list -> /api/v1/inbound/product/list
# /api/v1/inbound + /base/search -> /api/v1/inbound/base/search
app.register_blueprint(inbound_bp, url_prefix='/api/v1/inbound')
print("✅ Inbound (Buy, Semi, Product, Base) 模块注册成功")
@ -39,6 +38,22 @@ def create_app():
except ImportError as e:
print(f"❌ 错误: Inbound 模块导入失败: {e}")
# -----------------------------------------------------
# 2.2 注册通用打印模块 (Common Print) - [新增]
# -----------------------------------------------------
try:
from app.api.v1.common.print import print_bp
# 注册打印蓝图
# 前端请求地址: /common/print/preview
# 配合 baseURL=/api/v1最终对应后端: /api/v1/common/print/preview
app.register_blueprint(print_bp, url_prefix='/api/v1/common/print')
print("✅ Print (Label Printing) 模块注册成功")
except ImportError as e:
print(f"❌ 错误: Print 模块导入失败: {e}")
# =========================================================
# 3. 预加载数据模型 (解决 relationship 找不到模型的问题)
# =========================================================
@ -50,7 +65,7 @@ def create_app():
from app.models.inbound.buy import StockBuy
# 3. 半成品入库
from app.models.inbound.semi import StockSemi
# 4. 成品入库 (新增)
# 4. 成品入库
from app.models.inbound.product import StockProduct
# 开发环境如果需要自动建表,可以取消注释

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@ -0,0 +1,27 @@
# app/api/v1/common/print.py
from flask import Blueprint, request, jsonify
from app.services.print.label_service import LabelPrintService
from app.models.inbound.buy import StockBuy
# 引入其他模型 StockSemi, StockProduct
import traceback
print_bp = Blueprint('print', __name__)
@print_bp.route('/preview', methods=['POST'])
def preview_label():
try:
data = request.get_json()
# 如果只传了ID和类型可以在这里查库补全数据也可以直接前端传全量数据
img_base64 = LabelPrintService.generate_preview_image(data)
return jsonify({"code": 200, "msg": "success", "data": img_base64})
except Exception as e:
return jsonify({"code": 500, "msg": str(e)}), 500
@print_bp.route('/execute', methods=['POST'])
def execute_print():
try:
data = request.get_json()
LabelPrintService.send_to_printer(data)
return jsonify({"code": 200, "msg": "指令已发送至打印机"})
except Exception as e:
return jsonify({"code": 500, "msg": str(e)}), 500

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@ -1,11 +1,13 @@
# app/api/v1/inbound/buy.py
from flask import Blueprint, request, jsonify
from app.services.inbound.buy_service import BuyInboundService
import traceback
inbound_buy_bp = Blueprint('inbound_buy', __name__)
# ------------------------------------------------------------------
# 0. 基础物料搜索 (新增)
# 0. 基础物料搜索
# ------------------------------------------------------------------
@inbound_buy_bp.route('/search-base', methods=['GET'])
def search_base():
@ -25,6 +27,7 @@ def search_base():
traceback.print_exc()
return jsonify({"code": 500, "msg": str(e)}), 500
# ------------------------------------------------------------------
# 1. 获取列表
# ------------------------------------------------------------------
@ -38,8 +41,9 @@ def get_list():
except Exception as e:
return jsonify({"code": 500, "msg": str(e)}), 500
# ------------------------------------------------------------------
# 2. 新增入库
# 2. 新增入库 (修改:返回创建的对象数据)
# ------------------------------------------------------------------
@inbound_buy_bp.route('/submit', methods=['POST'])
def submit():
@ -47,12 +51,21 @@ def submit():
data = request.get_json()
if not data:
return jsonify({"code": 400, "msg": "No data"}), 400
BuyInboundService.handle_inbound(data)
return jsonify({"code": 200, "msg": "入库成功"})
# 调用 Service 处理入库,获取新创建的对象
new_stock = BuyInboundService.handle_inbound(data)
# 返回成功信息以及新创建的数据包含生成的ID和SKU供前端打印使用
return jsonify({
"code": 200,
"msg": "入库成功",
"data": new_stock.to_dict()
})
except Exception as e:
traceback.print_exc()
return jsonify({"code": 500, "msg": str(e)}), 500
# ------------------------------------------------------------------
# 3. 更新入库
# ------------------------------------------------------------------
@ -65,6 +78,7 @@ def update_buy(id):
except Exception as e:
return jsonify({"code": 500, "msg": str(e)}), 500
# ------------------------------------------------------------------
# 4. 删除
# ------------------------------------------------------------------

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@ -42,7 +42,8 @@ class StockBuy(db.Model):
detail_link = db.Column(db.Text)
arrival_photo = db.Column(db.Text)
# 注意SQL 中没有 remark 字段,这里已移除
# [新增] 全局打印流水号 (用于跨表连续编号,对应 Sequence: global_print_seq)
global_print_id = db.Column(db.Integer)
# 关系定义
material = db.relationship('MaterialBase', back_populates='stock_buys')
@ -83,5 +84,9 @@ class StockBuy(db.Model):
'purchaser_email': self.buyer_email,
'source_link': self.original_link,
'detail_link': self.detail_link,
'arrival_photo': self.arrival_photo
'arrival_photo': self.arrival_photo,
# [新增] 返回全局打印ID及其格式化字符串
'global_print_id': self.global_print_id,
'global_print_id_str': f"{self.global_print_id:08d}" if self.global_print_id else ""
}

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@ -1,11 +1,9 @@
# app/services/inbound/buy_service.py
from app.extensions import db
from app.models.inbound.buy import StockBuy
# ==============================================================================
# ✅ 修复点:基础物料模型实际位于 app/models/base.py
# ==============================================================================
from app.models.base import MaterialBase
from datetime import datetime
from sqlalchemy import or_, func
from sqlalchemy import or_, func, text
import traceback
@ -71,13 +69,36 @@ class BuyInboundService:
in_qty = float(data.get('in_quantity') or 0)
u_price = float(data.get('unit_price') or 0)
# ------------------------------------------------------------------
# 1. 获取全局打印流水号 (跨表唯一)
# ------------------------------------------------------------------
seq_sql = text("SELECT nextval('global_print_seq')")
result = db.session.execute(seq_sql)
next_global_id = result.scalar()
# ------------------------------------------------------------------
# 2. 自动生成 SKU (格式: 00000001)
# ------------------------------------------------------------------
generated_sku = f"{next_global_id:08d}"
# ------------------------------------------------------------------
# 3. 条码逻辑处理 (核心修改)
# 如果前端没传条码(barcode),则默认使用系统生成的 SKU 作为条码
# 这样保证了条码生成依据是 "自动填写的 SKU"
# ------------------------------------------------------------------
final_barcode = data.get('barcode')
if not final_barcode:
final_barcode = generated_sku
new_stock = StockBuy(
base_id=material.id,
sku=data.get('sku'),
global_print_id=next_global_id,
sku=generated_sku, # 自动生成的SKU
barcode=final_barcode, # 如果未输入则存入SKU值
in_date=in_date_val,
serial_number=data.get('serial_number'),
batch_number=data.get('batch_number'),
barcode=data.get('barcode'),
status='在库',
in_quantity=in_qty,
stock_quantity=in_qty,
@ -98,6 +119,8 @@ class BuyInboundService:
db.session.add(new_stock)
db.session.commit()
# 返回创建的对象实例
return new_stock
except Exception as e:
@ -264,7 +287,10 @@ class BuyInboundService:
'purchaser_email': item.buyer_email,
'source_link': item.original_link,
'detail_link': item.detail_link,
'arrival_photo': item.arrival_photo
'arrival_photo': item.arrival_photo,
'global_print_id': item.global_print_id,
'global_print_id_str': f"{item.global_print_id:08d}" if item.global_print_id else ""
}
items.append(d)

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@ -0,0 +1,198 @@
import socket
import base64
import os
from io import BytesIO
from PIL import Image, ImageDraw, ImageFont
# 引入条形码生成库
try:
import barcode
from barcode.writer import ImageWriter
except ImportError:
print("❌ 警告: 未安装 python-barcode 库,无法生成真实条形码。请执行: pip install python-barcode")
class LabelPrintService:
PRINTER_IP = "192.168.9.205"
PRINTER_PORT = 9100
# ================= 1. 尺寸与分辨率配置 (300 DPI) =================
DOTS_PER_MM = 12 # 300 DPI
LABEL_WIDTH_MM = 40
LABEL_HEIGHT_MM = 30
# 画布像素: 40mm -> 480px, 30mm -> 360px
LABEL_WIDTH = int(LABEL_WIDTH_MM * DOTS_PER_MM)
LABEL_HEIGHT = int(LABEL_HEIGHT_MM * DOTS_PER_MM)
# 顶部留白: 10mm (120px) - 内容从这里开始
TOP_MARGIN_MM = 5
TOP_MARGIN_PX = int(TOP_MARGIN_MM * DOTS_PER_MM)
@staticmethod
def _get_font(size):
"""获取字体"""
font_names = ["simhei.ttf", "msyh.ttf", "SimHei.ttf", "arial.ttf"]
base_dirs = [os.getcwd(), os.path.dirname(__file__)]
for d in base_dirs:
for name in font_names:
path = os.path.join(d, name)
if os.path.exists(path):
return ImageFont.truetype(path, size)
return ImageFont.load_default()
@staticmethod
def _generate_barcode_image(content, width_px, height_px):
"""
生成真实的条形码图片
"""
try:
# 使用 Code128 编码(通用性最强)
code128 = barcode.get('code128', content, writer=ImageWriter())
# 渲染到内存
buffer = BytesIO()
# write_text=False: 不在条码下方生成自带的数字(我们自己画)
code128.write(buffer, options={"write_text": False, "module_height": 10.0, "quiet_zone": 1.0})
# 打开生成的条码图
buffer.seek(0)
bc_img = Image.open(buffer)
# 强制调整大小以适应我们的布局
return bc_img.resize((width_px, height_px), Image.Resampling.LANCZOS)
except Exception as e:
print(f"条形码生成失败: {e}")
# 生成失败时返回一个黑色方块占位
return Image.new('RGB', (width_px, height_px), color='black')
@staticmethod
def _create_image_object(data):
"""
[绘图层] 生成标签图片
"""
# 1. 创建画布 (白底)
img = Image.new('RGB', (LabelPrintService.LABEL_WIDTH, LabelPrintService.LABEL_HEIGHT), color='white')
d = ImageDraw.Draw(img)
# 2. 统一字体配置 (字号 30)
UNIFIED_FONT_SIZE = 30
font = LabelPrintService._get_font(UNIFIED_FONT_SIZE)
# 3. 提取条码内容 (优先使用 SKU)
# 逻辑:使用自动生成的 SKU (如 00000001) 作为条码内容
sku_code = data.get('sku')
if not sku_code:
# 兜底逻辑:如果没有 SKU尝试用 serial_number 或 global_id
sku_code = data.get('serial_number') or str(data.get('global_print_id', '00000000')).zfill(8)
# ==================== 绘制布局 ====================
# X 轴偏移 (5mm)
GLOBAL_OFFSET_X = int(5 * LabelPrintService.DOTS_PER_MM)
# Y 轴起始: 10mm 处
CURRENT_Y = LabelPrintService.TOP_MARGIN_PX
# --- A. 绘制真实条形码 ---
bc_w = int(28 * LabelPrintService.DOTS_PER_MM) # 条码宽约 28mm
bc_h = int(6 * LabelPrintService.DOTS_PER_MM) # 条码高约 6mm
# 生成并粘贴条码
bc_img = LabelPrintService._generate_barcode_image(sku_code, bc_w, bc_h)
# 粘贴位置: (X, Y)
img.paste(bc_img, (GLOBAL_OFFSET_X - 5, CURRENT_Y))
# 更新 Y 坐标 (条码高度 + 间距)
CURRENT_Y += bc_h + 5
# --- B. 绘制文字 (统一加粗) ---
# 准备数据
name = str(data.get('material_name', '') or '-')
if len(name) > 8: name = name[:7] + ".."
spec = str(data.get('spec_model', '') or '-')
if len(spec) > 11: spec = spec[:10] + ".."
loc = str(data.get('warehouse_loc', '') or '-')
cat = str(data.get('category', '') or '')
typ = str(data.get('material_type', '') or '')
attr = f"{cat}/{typ}"
if len(attr) > 11: attr = attr[:10] + ".."
# 底部显示的文字SKU 编号
sku_str = f"NO.{sku_code}"
lines = [
f"名: {name}",
f"规: {spec}",
f"库: {loc}",
f"属: {attr}",
f"{sku_str}"
]
line_height = 36 # 行高 (字号30 + 6间距)
for line in lines:
# 边界检查
if CURRENT_Y + UNIFIED_FONT_SIZE > LabelPrintService.LABEL_HEIGHT:
break
# 绘制文字 (stroke_width=1 实现加粗效果)
d.text((GLOBAL_OFFSET_X, CURRENT_Y), line, font=font, fill='black', stroke_width=1, stroke_fill='black')
CURRENT_Y += line_height
return img
@staticmethod
def generate_preview_image(data):
img = LabelPrintService._create_image_object(data)
output_buffer = BytesIO()
img.save(output_buffer, format='JPEG')
base64_str = base64.b64encode(output_buffer.getvalue()).decode('utf-8')
return f"data:image/jpeg;base64,{base64_str}"
@staticmethod
def send_to_printer(data):
ip = LabelPrintService.PRINTER_IP
port = LabelPrintService.PRINTER_PORT
try:
# 1. 获取图像 (RGB)
img_rgb = LabelPrintService._create_image_object(data)
# 2. 图像转二值化 (白=1, 黑=0 的逻辑,不反转)
img_gray = img_rgb.convert('L')
img_bw = img_gray.convert('1', dither=Image.Dither.NONE)
# 获取位图数据
bitmap_data = img_bw.tobytes()
width_bytes = (img_bw.width + 7) // 8
height_dots = img_bw.height
# 3. TSPL 指令
header = (
f"SIZE {LabelPrintService.LABEL_WIDTH_MM} mm, {LabelPrintService.LABEL_HEIGHT_MM} mm\r\n"
"GAP 2 mm, 0 mm\r\n"
"CLS\r\n"
"DIRECTION 1\r\n"
"REFERENCE 0, 0\r\n"
).encode('gbk')
bitmap_cmd = f"BITMAP 0,0,{width_bytes},{height_dots},0,".encode('gbk')
footer = b"\r\nPRINT 1,1\r\n"
# 4. 发送
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(5)
s.connect((ip, port))
s.sendall(header + bitmap_cmd + bitmap_data + footer)
s.close()
return True
except Exception as e:
print(f"❌ 打印异常: {e}")
raise Exception(f"打印机连接失败: {str(e)}")

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@ -6,3 +6,5 @@ marshmallow-sqlalchemy==1.0.0
psycopg2-binary==2.9.9
python-dotenv==1.0.0
flask-cors==4.0.0
Pillow>=10.0.0
python-barcode>=0.14.0

Binary file not shown.

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@ -0,0 +1,17 @@
import request from '@/utils/request'
export function getLabelPreview(data: any) {
return request({
url: '/common/print/preview',
method: 'post',
data
})
}
export function executePrint(data: any) {
return request({
url: '/common/print/execute',
method: 'post',
data
})
}

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@ -91,8 +91,11 @@
</el-table-column>
</template>
<el-table-column label="操作" width="160" fixed="right" align="center">
<el-table-column label="操作" width="220" fixed="right" align="center">
<template #default="{ row }">
<el-button link type="warning" size="default" @click="handlePrint(row)">
<el-icon><Printer /></el-icon> 打印
</el-button>
<el-button link type="primary" size="default" @click="handleUpdate(row)">编辑</el-button>
<el-popconfirm title="确定删除该条记录吗?不可恢复。" @confirm="handleDelete(row)" width="220">
<template #reference>
@ -194,7 +197,15 @@
<div class="card-content">
<el-row :gutter="20">
<el-col :span="6"><el-form-item label="编码/SKU" prop="sku"><el-input v-model="form.sku" placeholder="选填" /></el-form-item></el-col>
<el-col :span="6">
<el-form-item label="编码/SKU" prop="sku">
<el-input
v-model="form.sku"
placeholder="系统自动生成 (0000000X)"
disabled
/>
</el-form-item>
</el-col>
<el-col :span="6">
<el-form-item label="入库日期" prop="in_date">
<el-date-picker v-model="form.in_date" type="date" value-format="YYYY-MM-DD" style="width:100%" disabled />
@ -372,17 +383,46 @@
<div class="dialog-footer">
<el-button @click="visible = false" size="large">取消</el-button>
<el-button type="primary" :loading="submitting" @click="submitForm" size="large" class="confirm-btn">
{{ dialogStatus === 'create' ? '确认入库' : '保存修改' }}
{{ dialogStatus === 'create' ? '确认入库并打印' : '保存修改' }}
</el-button>
</div>
</template>
</el-dialog>
<el-dialog
v-model="printVisible"
title="标签打印预览"
width="400px"
destroy-on-close
append-to-body
>
<div style="text-align: center;">
<div v-loading="printLoading" class="preview-box">
<img v-if="previewUrl" :src="previewUrl" alt="Label Preview" style="width: 100%; border: 1px solid #ccc;" />
<div v-else class="empty-preview">正在生成预览...</div>
</div>
<div style="margin-top: 20px; font-size: 14px; color: #666;">
<p>打印机 IP: 192.168.9.205</p>
<p>尺寸: 40mm x 30mm</p>
</div>
</div>
<template #footer>
<div class="dialog-footer">
<el-button @click="printVisible = false">取消</el-button>
<el-button type="primary" :loading="printing" @click="confirmPrint">
<el-icon><Printer /></el-icon> 确认打印
</el-button>
</div>
</template>
</el-dialog>
</div>
</template>
<script setup lang="ts">
import { ref, reactive, onMounted, watch } from 'vue'
import { Plus, Setting, Refresh, Search, Lock, Box, House, InfoFilled, Link } from '@element-plus/icons-vue'
import { Plus, Setting, Refresh, Search, Lock, Box, House, InfoFilled, Link, Printer } from '@element-plus/icons-vue'
import { ElMessage } from 'element-plus'
import dayjs from 'dayjs'
import {
@ -392,6 +432,7 @@ import {
deleteBuyInbound,
searchMaterialBase
} from '@/api/inbound/buy'
import { getLabelPreview, executePrint } from '@/api/common/print'
// ------------------------------------
// 状态与变量
@ -407,6 +448,13 @@ const formRef = ref()
const queryParams = reactive({ page: 1, pageSize: 15, keyword: '' })
const materialOptions = ref<any[]>([])
// 打印相关变量
const printVisible = ref(false)
const printLoading = ref(false)
const printing = ref(false)
const previewUrl = ref('')
const currentPrintData = ref<any>({})
const entryMode = ref('batch')
const modeLocked = ref(false)
@ -599,9 +647,6 @@ const querySearchCurrency = (queryString: string, cb: any) => {
const handleMaterialDropdownVisible = (visible: boolean) => {
if (visible) {
// 【修改点】: 展开时,如果列表为空,直接调用 API 加载前 20 条数据
// 同时也会把历史记录合并进去(在 handleSearchMaterial 内部处理或分开展示)
// 这里简单处理:直接调用 handleSearchMaterial('') 让后端返回默认数据
if (materialOptions.value.length === 0) {
handleSearchMaterial('')
}
@ -611,14 +656,11 @@ const handleMaterialDropdownVisible = (visible: boolean) => {
const handleSearchMaterial = async (query: string) => {
searchLoading.value = true
try {
// 即使 query 为空,后端现在也会返回数据
const res: any = await searchMaterialBase(query)
const apiResults = (res.data || []).map((i: any) => ({ ...i, isHistory: false }))
// 如果是空搜索,我们可以把本地历史记录插在前面,做个合并
if (!query) {
const history = getMaterialHistory()
// 简单去重:如果 API 返回的 ID 在历史记录里有,就跳过 API 的那个(优先显示历史标记)
const historyIds = new Set(history.map((h: any) => h.id))
const filteredApi = apiResults.filter((apiItem: any) => !historyIds.has(apiItem.id))
materialOptions.value = [...history, ...filteredApi]
@ -630,7 +672,6 @@ const handleSearchMaterial = async (query: string) => {
}
}
// 选中物料后 -> 存入历史 -> 填充表单
const onMaterialSelected = (val: number) => {
const item = materialOptions.value.find(i => i.id === val)
if (item) {
@ -758,7 +799,6 @@ const handleCreate = () => {
entryMode.value = 'batch'
form.batch_number = ''
visible.value = true
// 每次打开弹窗时,先清空选项,让下拉时触发“历史加载”
materialOptions.value = []
}
@ -806,7 +846,6 @@ const handleUpdate = (row: any) => {
form.detail_link = row.detail_link
form.arrival_photo = row.arrival_photo
// 编辑模式下,把当前物料塞入选项,防止显示为 ID
materialOptions.value = [{
id: row.base_id,
name: row.material_name,
@ -817,6 +856,9 @@ const handleUpdate = (row: any) => {
visible.value = true
}
// ------------------------------------
// 提交逻辑 (新增自动打印逻辑)
// ------------------------------------
const submitForm = async () => {
if (!formRef.value) return
await formRef.value.validate(async (valid: boolean) => {
@ -824,8 +866,24 @@ const submitForm = async () => {
submitting.value = true
try {
if (dialogStatus.value === 'create') {
await createBuyInbound(form)
// 1. 创建入库
const res: any = await createBuyInbound(form)
ElMessage.success('入库成功')
// 2. 自动打印 (使用返回的完整数据)
// res.data 包含了 newly created stock item, with generated ID and SKU
const newItem = res.data
if (newItem) {
ElMessage.info('正在发送打印指令...')
try {
await executePrint(newItem)
ElMessage.success('打印指令已发送')
} catch (printErr: any) {
console.error(printErr)
ElMessage.warning('入库成功,但自动打印失败:' + (printErr.msg || '未知错误'))
}
}
} else {
const payload = {
...form,
@ -836,7 +894,6 @@ const submitForm = async () => {
ElMessage.success('更新成功')
}
// 保存供应商等信息到历史记录
saveToHistory(HISTORY_KEYS.SUPPLIER, form.supplier_name)
saveToHistory(HISTORY_KEYS.PURCHASER, form.purchaser)
saveToHistory(HISTORY_KEYS.EMAIL, form.purchaser_email)
@ -862,6 +919,50 @@ const handleDelete = async (row: any) => {
}
}
// ------------------------------------
// 打印逻辑 (手动 & 预览)
// ------------------------------------
const handlePrint = async (row: any) => {
printVisible.value = true
printLoading.value = true
previewUrl.value = ''
const printData = {
global_print_id: row.global_print_id,
material_name: row.material_name,
spec_model: row.spec_model,
category: row.category,
material_type: row.material_type,
warehouse_loc: row.warehouse_loc,
serial_number: row.serial_number,
batch_number: row.batch_number,
sku: row.sku // 【重要】显式增加 SKU 字段传递给后端
}
currentPrintData.value = printData
try {
const res: any = await getLabelPreview(printData)
previewUrl.value = res.data
} catch(e) {
ElMessage.error('预览生成失败')
} finally {
printLoading.value = false
}
}
const confirmPrint = async () => {
printing.value = true
try {
await executePrint(currentPrintData.value)
ElMessage.success('指令已发送')
printVisible.value = false
} catch(e: any) {
ElMessage.error(e.msg || '打印失败')
} finally {
printing.value = false
}
}
const resetForm = () => {
materialOptions.value = []
Object.assign(form, {
@ -1031,4 +1132,14 @@ onMounted(() => fetchData())
.opt-name { font-weight: bold; }
.opt-spec { color: #8492a6; font-size: 13px; margin-right: 10px; }
.total-price-input :deep(.el-input__inner) { color: #F56C6C; font-weight: bold; }
.preview-box {
min-height: 150px;
display: flex;
justify-content: center;
align-items: center;
background: #f5f7fa;
border-radius: 4px;
}
.empty-preview { color: #909399; }
</style>