perf: 系统性能优化 - 数据库索引、缓存、GZIP压缩和查询合并

- 添加3个复合索引提升查询性能 (user_date, user_category, destination)
- 添加GZIP压缩和静态资源缓存 (maxAge: 1h)
- 添加API响应no-cache头
- 添加stats端点2分钟内存缓存 (per-user key, LRU淘汰)
- 合并多次数据库查询为单次查询
- 添加滚动防抖改善移动端体验
- 修复res.once内存泄漏问题

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package-lock.json

@@ -11,6 +11,7 @@
       "dependencies": {
         "bcryptjs": "^3.0.3",
         "better-sqlite3": "^12.6.2",
+        "compression": "^1.8.1",
         "cors": "^2.8.6",
         "express": "^5.2.1",
         "jsonwebtoken": "^9.0.3"
@@ -190,6 +191,60 @@
       "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==",
       "license": "ISC"
     },
+    "node_modules/compressible": {
+      "version": "2.0.18",
+      "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.18.tgz",
+      "integrity": "sha512-AF3r7P5dWxL8MxyITRMlORQNaOA2IkAFaTr4k7BUumjPtRpGDTZpl0Pb1XCO6JeDCBdp126Cgs9sMxqSjgYyRg==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": ">= 1.43.0 < 2"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/compression": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/compression/-/compression-1.8.1.tgz",
+      "integrity": "sha512-9mAqGPHLakhCLeNyxPkK4xVo746zQ/czLH1Ky+vkitMnWfWZps8r0qXuwhwizagCRttsL4lfG4pIOvaWLpAP0w==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "3.1.2",
+        "compressible": "~2.0.18",
+        "debug": "2.6.9",
+        "negotiator": "~0.6.4",
+        "on-headers": "~1.1.0",
+        "safe-buffer": "5.2.1",
+        "vary": "~1.1.2"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/compression/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "license": "MIT",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/compression/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
+      "license": "MIT"
+    },
+    "node_modules/compression/node_modules/negotiator": {
+      "version": "0.6.4",
+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.4.tgz",
+      "integrity": "sha512-myRT3DiWPHqho5PrJaIRyaMv2kgYf0mUVgBNOYMuCH5Ki1yEiQaf/ZJuQ62nvpc44wL5WDbTX7yGJi1Neevw8w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/content-disposition": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.0.1.tgz",
@@ -905,6 +960,15 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/on-headers": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/on-headers/-/on-headers-1.1.0.tgz",
+      "integrity": "sha512-737ZY3yNnXy37FHkQxPzt4UZ2UWPWiCZWLvFZ4fu5cueciegX0zGPnrlY6bwRg4FdQOe9YU8MkmJwGhoMybl8A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",

package.json

@@ -14,6 +14,7 @@
   "dependencies": {
     "bcryptjs": "^3.0.3",
     "better-sqlite3": "^12.6.2",
+    "compression": "^1.8.1",
     "cors": "^2.8.6",
     "express": "^5.2.1",
     "jsonwebtoken": "^9.0.3"

public/js/order-list.js

@@ -1,3 +1,12 @@
+// 防抖工具函数
+function debounce(fn, delay) {
+  let timeoutId;
+  return function(...args) {
+    clearTimeout(timeoutId);
+    timeoutId = setTimeout(() => fn.apply(this, args), delay);
+  };
+}
+
 // 全局状态变量（供 app.js 引用）
 var orderPage = 1, orderHasMore = true, orderLoading = false;
 var otherIncomePage = 1, otherIncomeHasMore = true, otherIncomeLoading = false;
@@ -97,8 +106,8 @@ function renderMilkTeaItem(r) {
     '<div class="order-item-bottom"><span>' + (r.source || '') + '</span><span>' + time + '</span></div></div>';
 }
 
-// 滚动加载
+// 滚动加载（带防抖）
-window.addEventListener('scroll', () => {
+const handleListScroll = debounce(() => {
   const pageListMap = [
     { page: 'orderListPage', list: 'orderList' },
     { page: 'dispatchListPage', list: 'dispatchList' },
@@ -118,7 +127,9 @@ window.addEventListener('scroll', () => {
       break;
     }
   }
-});
+}, 100);
+
+window.addEventListener('scroll', handleListScroll);
 
 // 兼容旧接口
 async function loadOrders(append) { return loadList('orderList', append); }

server/app.js

@@ -1,6 +1,7 @@
 const express = require('express');
 const cors = require('cors');
 const path = require('path');
+const compression = require('compression');
 
 const db = require('./db');
 const { router: authRouter, auth } = require('./routes/auth');
@@ -12,9 +13,18 @@ const app = express();
 
 app.use(cors());
 app.use(express.json());
-app.use(express.static(path.join(__dirname, '..', 'public')));
+app.use(compression());
+app.use(express.static(path.join(__dirname, '..', 'public'), {
+  maxAge: '1h',
+  etag: true
+}));
 
 // 联系人自动补全
+app.use('/api', (req, res, next) => {
+  res.setHeader('Cache-Control', 'no-cache');
+  next();
+});
+
 app.get('/api/contacts', auth, (req, res) => {
   const field = req.query.field;
   const allowed = ['boss', 'partner', 'source', 'destination'];

server/db.js

@@ -40,6 +40,9 @@ db.exec(`
   CREATE INDEX IF NOT EXISTS idx_records_boss ON records(boss);
   CREATE INDEX IF NOT EXISTS idx_records_partner ON records(partner);
   CREATE INDEX IF NOT EXISTS idx_records_source ON records(source);
+  CREATE INDEX IF NOT EXISTS idx_records_user_date ON records(user_id, created_at);
+  CREATE INDEX IF NOT EXISTS idx_records_user_category ON records(user_id, category, created_at);
+  CREATE INDEX IF NOT EXISTS idx_records_destination ON records(destination);
 `);
 
 // 迁移：去掉 category 的 CHECK 约束

server/routes/stats.js

@@ -4,6 +4,47 @@ const { getMonthRange } = require('../utils/helpers');
 
 const router = express.Router();
 
+// 内存缓存（限制大小，基于LRU）
+const statsCache = new Map();
+const CACHE_TTL = 2 * 60 * 1000;
+const MAX_CACHE_SIZE = 100;
+
+function getCached(key, fetchFn) {
+  const cached = statsCache.get(key);
+  if (cached && Date.now() - cached.ts < CACHE_TTL) {
+    // LRU: move to end
+    statsCache.delete(key);
+    statsCache.set(key, cached);
+    return Promise.resolve(cached.data);
+  }
+  if (statsCache.size >= MAX_CACHE_SIZE) {
+    // Delete oldest entry
+    const firstKey = statsCache.keys().next().value;
+    statsCache.delete(firstKey);
+  }
+  return fetchFn().then(data => {
+    statsCache.set(key, { data, ts: Date.now() });
+    return data;
+  }).catch(err => {
+    console.error('Cache fetch error:', err.message);
+    return fetchFn(); // fallback to direct fetch
+  });
+}
+
+// POST/DELETE/PUT/PATCH 后清除当前用户的缓存
+router.use((req, res, next) => {
+  res.once('finish', () => {
+    if (['POST', 'DELETE', 'PUT', 'PATCH'].includes(req.method) && req.user?.id) {
+      for (const key of statsCache.keys()) {
+        if (key.includes(`:${req.user.id}:`)) {
+          statsCache.delete(key);
+        }
+      }
+    }
+  });
+  next();
+});
+
 // 格式化本地日期为 YYYY-MM-DD
 function formatLocalDate(date) {
   const y = date.getFullYear();
@@ -15,6 +56,8 @@ function formatLocalDate(date) {
 // 本月统计
 router.get('/monthly', (req, res) => {
   const { startDate, endDate } = getMonthRange(req.query.year, req.query.month);
+  const cacheKey = `monthly:${req.user.id}:${startDate}:${endDate}`;
+  getCached(cacheKey, () => {
     const stats = db.prepare(`
       SELECT
         COALESCE(SUM(CASE WHEN category = '接单' THEN quantity ELSE 0 END), 0) as take_order_count,
@@ -30,7 +73,8 @@ router.get('/monthly', (req, res) => {
       FROM records
       WHERE user_id = ? AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
     `).get(req.user.id, startDate, endDate);
-  res.json(stats);
+    return stats;
+  }).then(stats => res.json(stats));
 });
 
 // 月收入/支出记录列表
@@ -40,7 +84,6 @@ router.get('/monthly-records', (req, res) => {
   const { startDate, endDate } = getMonthRange(req.query.year, req.query.month);
   const offset = (Number(page) - 1) * Number(limit);
 
-  // 合并 summary 和 total 为一次查询
   const stats = db.prepare(`
     SELECT COALESCE(SUM(amount), 0) as total, COUNT(*) as count
     FROM records WHERE user_id = ? AND type = ? AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
@@ -57,19 +100,7 @@ router.get('/monthly-records', (req, res) => {
 
 // 年度净收入按年统计
 router.get('/yearly-net-income', (req, res) => {
-  // 获取所有年份数据
+  const combined = db.prepare(`
-  const yearlyStats = db.prepare(`
-    SELECT
-      strftime('%Y', created_at) as year,
-      COALESCE(SUM(CASE WHEN type = 'income' THEN amount ELSE 0 END), 0) as total_income,
-      COALESCE(SUM(CASE WHEN type = 'expense' THEN amount ELSE 0 END), 0) as total_expense
-    FROM records
-    WHERE user_id = ?
-    GROUP BY year ORDER BY year DESC
-  `).all(req.user.id);
-
-  // 获取所有年份的每月数据
-  const monthlyByYear = db.prepare(`
     SELECT
       strftime('%Y', created_at) as year,
       strftime('%m', created_at) as month,
@@ -77,33 +108,50 @@ router.get('/yearly-net-income', (req, res) => {
       COALESCE(SUM(CASE WHEN type = 'expense' THEN amount ELSE 0 END), 0) as total_expense
     FROM records
     WHERE user_id = ?
-    GROUP BY year, month ORDER BY year DESC, month
+    GROUP BY year, month
-  `).all(req.user.id);
+    UNION ALL
-
-  // 按年份分组每月数据
-  const monthlyData = {};
-  monthlyByYear.forEach(m => {
-    if (!monthlyData[m.year]) monthlyData[m.year] = [];
-    monthlyData[m.year].push({
-      month: m.month,
-      total_income: m.total_income,
-      total_expense: m.total_expense
-    });
-  });
-
-  const grandTotal = db.prepare(`
     SELECT
+      strftime('%Y', created_at) as year,
+      '00' as month,
       COALESCE(SUM(CASE WHEN type = 'income' THEN amount ELSE 0 END), 0) as total_income,
       COALESCE(SUM(CASE WHEN type = 'expense' THEN amount ELSE 0 END), 0) as total_expense
-    FROM records WHERE user_id = ?
+    FROM records
-  `).get(req.user.id);
+    WHERE user_id = ?
+    GROUP BY year
+  `).all(req.user.id, req.user.id);
 
+  const yearlyStats = [];
+  const monthlyData = {};
+  let grandTotal = { total_income: 0, total_expense: 0 };
+
+  combined.forEach(row => {
+    grandTotal.total_income += row.total_income;
+    grandTotal.total_expense += row.total_expense;
+    if (row.month === '00') {
+      yearlyStats.push({
+        year: row.year,
+        total_income: row.total_income,
+        total_expense: row.total_expense
+      });
+    } else {
+      if (!monthlyData[row.year]) monthlyData[row.year] = [];
+      monthlyData[row.year].push({
+        month: row.month,
+        total_income: row.total_income,
+        total_expense: row.total_expense
+      });
+    }
+  });
+
+  yearlyStats.sort((a, b) => b.year - a.year);
   res.json({ yearlyStats, monthlyData, grandTotal });
 });
 
 // 陪玩派单榜预览
 router.get('/partner-ranking/preview', (req, res) => {
   const { startDate, endDate } = getMonthRange(req.query.year, req.query.month);
+  const cacheKey = `partner-ranking-preview:${req.user.id}:${startDate}:${endDate}`;
+  getCached(cacheKey, () => {
     const rows = db.prepare(`
       SELECT partner, COALESCE(SUM(quantity), 0) as dispatch_count, COALESCE(SUM(amount), 0) as dispatch_income
       FROM records
@@ -111,7 +159,8 @@ router.get('/partner-ranking/preview', (req, res) => {
         AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
       GROUP BY partner ORDER BY dispatch_count DESC LIMIT 10
     `).all(req.user.id, startDate, endDate);
-  res.json(rows);
+    return rows;
+  }).then(rows => res.json(rows));
 });
 
 // 陪玩派单榜详情
@@ -141,24 +190,23 @@ router.get('/partner-ranking', (req, res) => {
   rows.forEach(row => {
     row.partner_income = (row.dispatch_income || 0) - (row.rebate_income || 0);
   });
-  const summary = db.prepare(`
+  const summaryStats = db.prepare(`
     SELECT
-      COALESCE(SUM(quantity), 0) as total_dispatch_count,
+      COALESCE(SUM(CASE WHEN category = '派单' THEN quantity ELSE 0 END), 0) as total_dispatch_count,
-      COALESCE(SUM(quantity * COALESCE(unit_price, 0)), 0) as total_dispatch_income,
+      COALESCE(SUM(CASE WHEN category = '派单' THEN quantity * COALESCE(unit_price, 0) ELSE 0 END), 0) as total_dispatch_income,
-      COALESCE(SUM(amount), 0) as total_rebate_income,
+      COALESCE(SUM(CASE WHEN category = '派单' THEN amount ELSE 0 END), 0) as total_rebate_income,
-      COALESCE(SUM(quantity * COALESCE(unit_price, 0)), 0) - COALESCE(SUM(amount), 0) as total_partner_income
+      COALESCE(SUM(CASE WHEN category = '奶茶' THEN amount ELSE 0 END), 0) as total_milkTea_income
     FROM records
-    WHERE user_id = ? AND category = '派单' AND partner IS NOT NULL AND partner != ''
+    WHERE user_id = ? AND type = 'income' AND category IN ('派单', '奶茶')
       AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
   `).get(req.user.id, start, end);
-  // 获取奶茶收入
+  const summary = {
-  const milkTeaStats = db.prepare(`
+    total_dispatch_count: summaryStats.total_dispatch_count,
-    SELECT COALESCE(SUM(amount), 0) as total_milkTea_income
+    total_dispatch_income: summaryStats.total_dispatch_income,
-    FROM records
+    total_rebate_income: summaryStats.total_rebate_income,
-    WHERE user_id = ? AND type = 'income' AND category = '奶茶'
+    total_partner_income: summaryStats.total_dispatch_income - summaryStats.total_rebate_income,
-      AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
+    total_milkTea_income: summaryStats.total_milkTea_income
-  `).get(req.user.id, start, end);
+  };
-  summary.total_milkTea_income = milkTeaStats.total_milkTea_income;
   res.json({ rows, summary });
 });
 
@@ -169,22 +217,18 @@ router.get('/take-ranking', (req, res) => {
     FROM records WHERE user_id = ? AND category = '接单' AND boss IS NOT NULL AND boss != ''
     GROUP BY boss ORDER BY count DESC
   `).all(req.user.id);
-  // 获取接单总收入和红包收入
   const stats = db.prepare(`
     SELECT
-      COALESCE(SUM(quantity), 0) as total_take_count,
+      COALESCE(SUM(CASE WHEN category = '接单' THEN quantity ELSE 0 END), 0) as total_take_count,
-      COALESCE(SUM(amount), 0) as total_take_income
+      COALESCE(SUM(CASE WHEN category = '接单' THEN amount ELSE 0 END), 0) as total_take_income,
-    FROM records WHERE user_id = ? AND category = '接单'
+      COALESCE(SUM(CASE WHEN category = '红包收入' THEN amount ELSE 0 END), 0) as total_redEnvelope_income
-  `).get(req.user.id);
+    FROM records WHERE user_id = ? AND type = 'income' AND category IN ('接单', '红包收入')
-  const redEnvelopeStats = db.prepare(`
-    SELECT COALESCE(SUM(amount), 0) as total_redEnvelope_income
-    FROM records WHERE user_id = ? AND type = 'income' AND category = '红包收入'
   `).get(req.user.id);
   const result = {
     rows: rows,
     total_take_count: stats.total_take_count,
     total_take_income: stats.total_take_income,
-    total_redEnvelope_income: redEnvelopeStats.total_redEnvelope_income
+    total_redEnvelope_income: stats.total_redEnvelope_income
   };
   res.json(result);
 });
@@ -204,19 +248,16 @@ router.get('/dispatch-ranking', (req, res) => {
   rows.forEach(row => {
     row.partner_income = (row.dispatch_income || 0) - (row.rebate_income || 0);
   });
-  // 获取派单总数和奶茶收入
+  const stats = db.prepare(`
-  const dispatchTotal = db.prepare(`
+    SELECT
-    SELECT COALESCE(SUM(quantity), 0) as total_dispatch_count
+      COALESCE(SUM(CASE WHEN category = '派单' THEN quantity ELSE 0 END), 0) as total_dispatch_count,
-    FROM records WHERE user_id = ? AND category = '派单'
+      COALESCE(SUM(CASE WHEN category = '奶茶' THEN amount ELSE 0 END), 0) as total_milkTea_income
-  `).get(req.user.id);
+    FROM records WHERE user_id = ? AND type = 'income' AND category IN ('派单', '奶茶')
-  const milkTeaStats = db.prepare(`
-    SELECT COALESCE(SUM(amount), 0) as total_milkTea_income
-    FROM records WHERE user_id = ? AND type = 'income' AND category = '奶茶'
   `).get(req.user.id);
   const result = {
     rows: rows,
-    total_dispatch_count: dispatchTotal.total_dispatch_count,
+    total_dispatch_count: stats.total_dispatch_count,
-    total_milkTea_income: milkTeaStats.total_milkTea_income
+    total_milkTea_income: stats.total_milkTea_income
   };
   res.json(result);
 });
@@ -252,7 +293,6 @@ router.get('/boss-records', (req, res) => {
     dateParams = [startDate, endDate];
   }
 
-  // 合并 summary 查询为一次
   const summary = db.prepare(`
     SELECT
       COALESCE(SUM(CASE WHEN type = 'income' THEN amount ELSE 0 END), 0) as my_income,
@@ -298,8 +338,6 @@ router.get('/partner-records', (req, res) => {
     dateParams = [startDate, endDate];
   }
 
-  // 合并 summary 查询为一次
-  // 注意: source 在 CASE 和 WHERE 中各出现一次,都需要 partner 值
   const summary = db.prepare(`
     SELECT
       COALESCE(SUM(CASE WHEN category = '派单' THEN quantity ELSE 0 END), 0) as dispatch_count,
@@ -347,15 +385,17 @@ router.get('/daily-income', (req, res) => {
   endDay.setDate(endDay.getDate() + 1);
   const endDate = formatLocalDate(endDay);
 
+  const cacheKey = `daily-income:${req.user.id}:${startDate}`;
+  getCached(cacheKey, () => {
     const rows = db.prepare(`
       SELECT DATE(created_at, 'localtime') as date, COALESCE(SUM(amount), 0) as income
       FROM records WHERE user_id = ? AND type = 'income' AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
       GROUP BY DATE(created_at, 'localtime')
     `).all(req.user.id, startDate, endDate);
-
     const map = {};
     rows.forEach(r => { map[r.date] = r.income; });
-  res.json(days.map(d => ({ date: d, income: map[d] || 0 })));
+    return days.map(d => ({ date: d, income: map[d] || 0 }));
+  }).then(data => res.json(data));
 });
 
 // 某天收入记录详情
@@ -367,26 +407,24 @@ router.get('/daily-detail', (req, res) => {
   nextDay.setDate(nextDay.getDate() + 1);
   const endDate = formatLocalDate(nextDay);
 
-  const summary = db.prepare(`
+  const stats = db.prepare(`
-    SELECT COALESCE(SUM(amount), 0) as total_income
+    SELECT COALESCE(SUM(amount), 0) as total_income, COUNT(*) as count
     FROM records WHERE user_id = ? AND type = 'income' AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
   `).get(req.user.id, date, endDate);
 
-  const total = db.prepare(`
-    SELECT COUNT(*) as count FROM records WHERE user_id = ? AND type = 'income' AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
-  `).get(req.user.id, date, endDate).count;
-
   const records = db.prepare(`
     SELECT * FROM records WHERE user_id = ? AND type = 'income' AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
     ORDER BY created_at DESC LIMIT ? OFFSET ?
   `).all(req.user.id, date, endDate, Number(limit), offset);
 
-  res.json({ total_income: summary.total_income, records, page: Number(page), limit: Number(limit), totalCount: total });
+  res.json({ total_income: stats.total_income, records, page: Number(page), limit: Number(limit), totalCount: stats.count });
 });
 
 // 老板收入排行 - 首页预览
 router.get('/boss-ranking/preview', (req, res) => {
   const { startDate, endDate } = getMonthRange(req.query.year, req.query.month);
+  const cacheKey = `boss-ranking-preview:${req.user.id}:${startDate}:${endDate}`;
+  getCached(cacheKey, () => {
     const rows = db.prepare(`
       SELECT COALESCE(boss, source) as boss, SUM(amount) as total_income,
         COALESCE(SUM(CASE WHEN category = '接单' THEN quantity ELSE 0 END), 0) as take_count,
@@ -397,7 +435,8 @@ router.get('/boss-ranking/preview', (req, res) => {
         AND DATE(created_at, 'localtime') >= ? AND DATE(created_at, 'localtime') < ?
       GROUP BY COALESCE(boss, source) ORDER BY total_income DESC LIMIT 10
     `).all(req.user.id, startDate, endDate);
-  res.json(rows);
+    return rows;
+  }).then(rows => res.json(rows));
 });
 
 // 老板收入排行 - 详情页（支持筛选）