JavaScript 高级错误处理实战示例

群发软件 · 发表于 7 天前


	JavaScript 高级错误处理实战示例 2.png (1.42 MB, 下载次数: 0) 7 天前上传 3.png (1.51 MB, 下载次数: 0) 7 天前上传 /** * ============================================ * JavaScript 高级错误处理实战示例 * 演示企业级应用中的完整错误处理机制 * 包含：自定义错误类、异步操作、数据验证、事务管理等 * 交流QQ群: 711841924 (群一) / 528816639 (安卓内测群) * err * ============================================ / // ==================== 自定义错误类定义 ==================== // 基础应用错误类 function AppError(message, code) { this.name = "AppError"; this.message = message; this.code = code \|\| "UNKNOWN_ERROR"; this.timestamp = new Date().toISOString(); } // 用户相关错误 function UserError(message, code) { this.name = "UserError"; this.message = message; this.code = code \|\| "USER_ERROR"; this.timestamp = new Date().toISOString(); } // 数据库相关错误 function DatabaseError(message, code) { this.name = "DatabaseError"; this.message = message; this.code = code \|\| "DB_ERROR"; this.timestamp = new Date().toISOString(); } // 业务逻辑错误 function BusinessError(message, code) { this.name = "BusinessError"; this.message = message; this.code = code \|\| "BUSINESS_ERROR"; this.timestamp = new Date().toISOString(); } // 网络请求错误 function NetworkError(message, code) { this.name = "NetworkError"; this.message = message; this.code = code \|\| "NETWORK_ERROR"; this.timestamp = new Date().toISOString(); } // ==================== 模拟数据存储 ==================== var mockDatabase = { users: [ { id: 1, username: "admin", email: "admin@example.com", role: "admin", status: "active" }, { id: 2, username: "user1", email: "user1@example.com", role: "user", status: "active" }, { id: 3, username: "user2", email: "user2@example.com", role: "user", status: "inactive" } ], products: [ { id: 101, name: "笔记本电脑", price: 5999, stock: 10, category: "electronics" }, { id: 102, name: "智能手机", price: 3999, stock: 50, category: "electronics" }, { id: 103, name: "办公椅", price: 899, stock: 25, category: "furniture" } ], orders: [] }; // ==================== 工具函数 ==================== // 日志记录器 function Logger(level, message, context) { var timestamp = new Date().toISOString(); var logEntry = "[" + timestamp + "] [" + level + "] " + message; if (context) { logEntry += " \| Context: " + JSON.stringify(context); } switch(level.toUpperCase()) { case "ERROR": printl("❌ " + logEntry); break; case "WARN": printl("⚠️ " + logEntry); break; case "INFO": printl("ℹ️ " + logEntry); break; case "DEBUG": printl("🔍 " + logEntry); break; default: printl(logEntry); } } // 输入验证器 function Validator() { this.errors = []; } Validator.prototype.validateEmail = function(email) { if (!email \|\| typeof email !== 'string') { throw new UserError("邮箱地址不能为空", "EMAIL_REQUIRED"); } if (email.indexOf('@') === -1 \|\| email.indexOf('.') === -1) { throw new UserError("邮箱格式不正确", "INVALID_EMAIL_FORMAT"); } return true; }; Validator.prototype.validateUsername = function(username) { if (!username \|\| typeof username !== 'string') { throw new UserError("用户名不能为空", "USERNAME_REQUIRED"); } if (username.length < 3 \|\| username.length > 20) { throw new UserError("用户名长度必须在3-20个字符之间", "INVALID_USERNAME_LENGTH"); } if (!/^[a-zA-Z0-9_]+$/.test(username)) { throw new UserError("用户名只能包含字母、数字和下划线", "INVALID_USERNAME_CHARS"); } return true; }; Validator.prototype.validatePassword = function(password) { if (!password \|\| typeof password !== 'string') { throw new UserError("密码不能为空", "PASSWORD_REQUIRED"); } if (password.length < 6) { throw new UserError("密码长度至少为6个字符", "PASSWORD_TOO_SHORT"); } if (!/[A-Z]/.test(password)) { throw new UserError("密码必须包含至少一个大写字母", "PASSWORD_NO_UPPERCASE"); } if (!/[0-9]/.test(password)) { throw new UserError("密码必须包含至少一个数字", "PASSWORD_NO_NUMBER"); } return true; }; Validator.prototype.validateProductData = function(product) { if (!product) { throw new BusinessError("产品数据不能为空", "PRODUCT_DATA_REQUIRED"); } if (!product.name \|\| product.name.trim() === "") { throw new BusinessError("产品名称不能为空", "PRODUCT_NAME_REQUIRED"); } if (typeof product.price !== 'number' \|\| product.price <= 0) { throw new BusinessError("产品价格必须为正数", "INVALID_PRODUCT_PRICE"); } if (typeof product.stock !== 'number' \|\| product.stock < 0) { throw new BusinessError("产品库存不能为负数", "INVALID_PRODUCT_STOCK"); } return true; }; // ==================== 核心业务函数 ==================== // 用户注册功能（包含完整错误处理） function registerUser(userData) { Logger("INFO", "开始用户注册流程", { username: userData.username }); var result = { success: false, userId: null, message: "" }; var validator = new Validator(); try { // 步骤1: 验证输入数据 Logger("DEBUG", "执行输入验证"); validator.validateUsername(userData.username); validator.validateEmail(userData.email); validator.validatePassword(userData.password); Logger("INFO", "输入验证通过"); // 步骤2: 检查用户是否已存在 Logger("DEBUG", "检查用户是否存在"); var existingUser = mockDatabase.users.find(function(u) { return u.username === userData.username; }); if (existingUser) { throw new UserError("用户名已存在", "USERNAME_EXISTS"); } // 步骤3: 创建新用户 Logger("DEBUG", "创建新用户记录"); var newUser = { id: mockDatabase.users.length + 1, username: userData.username, email: userData.email, role: "user", status: "active", createdAt: new Date().toISOString() }; mockDatabase.users.push(newUser); result.success = true; result.userId = newUser.id; result.message = "用户注册成功"; Logger("INFO", "用户注册成功", { userId: newUser.id }); } catch (error) { Logger("err", "用户注册失败", { error: error.message, code: error.code }); result.message = error.message; result.errorCode = error.code; // 根据错误类型进行特殊处理 if (error instanceof UserError) { Logger("WARN", "用户输入验证失败"); } else if (error instanceof BusinessError) { Logger("WARN", "业务逻辑错误"); } else { Logger("err", "未知系统错误"); } } finally { Logger("DEBUG", "用户注册流程结束"); } return result; } // 订单处理功能（演示事务管理） function processOrder(orderData) { Logger("INFO", "开始处理订单", { productId: orderData.productId, quantity: orderData.quantity }); var result = { success: false, orderId: null, message: "" }; var transactionStarted = false; try { // 步骤1: 验证订单数据 Logger("DEBUG", "验证订单数据"); if (!orderData.productId \|\| !orderData.quantity) { throw new BusinessError("订单数据不完整", "INCOMPLETE_ORDER_DATA"); } if (orderData.quantity <= 0) { throw new BusinessError("订购数量必须大于0", "INVALID_QUANTITY"); } // 步骤2: 查找产品 Logger("DEBUG", "查找产品信息"); var product = mockDatabase.products.find(function(p) { return p.id === orderData.productId; }); if (!product) { throw new BusinessError("产品不存在", "PRODUCT_NOT_FOUND"); } // 步骤3: 检查库存 Logger("DEBUG", "检查产品库存"); if (product.stock < orderData.quantity) { throw new BusinessError("库存不足，当前库存: " + product.stock, "INSUFFICIENT_STOCK"); } // 步骤4: 开始事务（模拟） Logger("DEBUG", "开始订单事务"); transactionStarted = true; // 步骤5: 更新库存 Logger("DEBUG", "更新产品库存"); product.stock -= orderData.quantity; // 步骤6: 创建订单记录 Logger("DEBUG", "创建订单记录"); var newOrder = { id: mockDatabase.orders.length + 1, productId: orderData.productId, productName: product.name, quantity: orderData.quantity, totalPrice: product.price orderData.quantity, status: "confirmed", createdAt: new Date().toISOString() }; mockDatabase.orders.push(newOrder); // 步骤7: 提交事务 Logger("DEBUG", "提交订单事务"); transactionStarted = false; result.success = true; result.orderId = newOrder.id; result.message = "订单处理成功"; Logger("INFO", "订单处理成功", { orderId: newOrder.id, total: newOrder.totalPrice }); } catch (error) { Logger("err", "订单处理失败", { error: error.message, code: error.code }); result.message = error.message; result.errorCode = error.code; // 如果事务已开始，则回滚 if (transactionStarted) { Logger("WARN", "执行事务回滚"); // 在实际应用中这里会恢复库存等状态 transactionStarted = false; } } finally { Logger("DEBUG", "订单处理流程结束"); } return result; } // 数据查询功能（演示多种查询场景） function queryData(queryType, filters) { Logger("INFO", "执行数据查询", { type: queryType, filters: filters }); var result = { success: false, data: [], count: 0, message: "" }; try { // 参数验证 if (!queryType) { throw new AppError("查询类型不能为空", "QUERY_TYPE_REQUIRED"); } switch (queryType.toLowerCase()) { case "users": Logger("DEBUG", "查询用户数据"); if (filters && filters.role) { result.data = mockDatabase.users.filter(function(u) { return u.role === filters.role; }); } else { result.data = mockDatabase.users.slice(); // 返回副本 } break; case "products": Logger("DEBUG", "查询产品数据"); if (filters && filters.category) { result.data = mockDatabase.products.filter(function(p) { return p.category === filters.category; }); } else if (filters && filters.minPrice) { result.data = mockDatabase.products.filter(function(p) { return p.price >= filters.minPrice; }); } else { result.data = mockDatabase.products.slice(); } break; case "orders": Logger("DEBUG", "查询订单数据"); if (filters && filters.status) { result.data = mockDatabase.orders.filter(function(o) { return o.status === filters.status; }); } else { result.data = mockDatabase.orders.slice(); } break; default: throw new AppError("不支持的查询类型: " + queryType, "UNSUPPORTED_QUERY_TYPE"); } result.count = result.data.length; result.success = true; result.message = "查询成功，返回 " + result.count + " 条记录"; Logger("INFO", "数据查询成功", { count: result.count }); } catch (error) { Logger("err", "数据查询失败", { error: error.message, code: error.code }); result.message = error.message; result.errorCode = error.code; } finally { Logger("DEBUG", "数据查询流程结束"); } return result; } // 批量操作功能（演示复杂的错误处理） function batchProcess(items, operation) { Logger("INFO", "开始批量操作", { itemCount: items.length, operation: operation }); var results = { successful: [], failed: [], summary: {} }; try { for (var i = 0; i < items.length; i++) { var item = items[i]; var itemResult = { index: i, item: item, success: false, error: null }; try { // 对每个项目执行操作 switch (operation) { case "validate": // 验证操作 if (!item \|\| typeof item !== 'object') { throw new AppError("无效的项目数据", "INVALID_ITEM"); } itemResult.success = true; break; case "transform": // 转换操作 if (!item.name) { throw new AppError("项目缺少名称字段", "MISSING_NAME_FIELD"); } item.transformed = item.name.toUpperCase(); itemResult.success = true; break; case "process": // 处理操作（模拟） if (Math.random() > 0.8) { // 20%概率失败 throw new AppError("随机处理失败", "RANDOM_FAILURE"); } itemResult.success = true; break; default: throw new AppError("不支持的操作类型: " + operation, "UNSUPPORTED_OPERATION"); } results.successful.push(itemResult); } catch (itemError) { Logger("WARN", "批量操作中单个项目失败", { index: i, error: itemError.message }); itemResult.error = itemError.message; results.failed.push(itemResult); } } // 生成摘要 results.summary = { total: items.length, successful: results.successful.length, failed: results.failed.length, successRate: Math.round((results.successful.length / items.length) * 100) + "%" }; Logger("INFO", "批量操作完成", results.summary); } catch (batchError) { Logger("err", "批量操作整体失败", { error: batchError.message }); throw batchError; // 重新抛出严重错误 } finally { Logger("DEBUG", "批量操作流程结束"); } return results; } // ==================== 测试用例 ==================== function runTests() { Logger("INFO", "========== 开始运行测试用例 =========="); // 测试1: 成功的用户注册 Logger("INFO", "--- 测试1: 成功用户注册 ---"); var testUser1 = { username: "newuser1", email: "newuser1@example.com", password: "Password123" }; var regResult1 = registerUser(testUser1); printl("测试结果: " + (regResult1.success ? "✅ 通过" : "❌ 失败")); sleep.second(2); // 测试2: 失败的用户注册（用户名太短） Logger("INFO", "--- 测试2: 用户名太短 ---"); var testUser2 = { username: "ab", email: "short@example.com", password: "Password123" }; var regResult2 = registerUser(testUser2); printl("测试结果: " + (!regResult2.success ? "✅ 通过" : "❌ 失败")); sleep.second(2); // 测试3: 失败的用户注册（邮箱格式错误） Logger("INFO", "--- 测试3: 邮箱格式错误 ---"); var testUser3 = { username: "validuser", email: "invalid-email", password: "Password123" }; var regResult3 = registerUser(testUser3); printl("测试结果: " + (!regResult3.success ? "✅ 通过" : "❌ 失败")); sleep.second(2); // 测试4: 成功的订单处理 Logger("INFO", "--- 测试4: 成功订单处理 ---"); var testOrder1 = { productId: 101, quantity: 2 }; var orderResult1 = processOrder(testOrder1); printl("测试结果: " + (orderResult1.success ? "✅ 通过" : "❌ 失败")); sleep.second(2); // 测试5: 失败的订单处理（库存不足） Logger("INFO", "--- 测试5: 库存不足 ---"); var testOrder2 = { productId: 101, quantity: 100 // 超过库存 }; var orderResult2 = processOrder(testOrder2); printl("测试结果: " + (!orderResult2.success ? "✅ 通过" : "❌ 失败")); sleep.second(2); // 测试6: 数据查询 Logger("INFO", "--- 测试6: 查询活跃用户 ---"); var queryResult1 = queryData("users", { role: "user" }); printl("查询结果: " + (queryResult1.success ? "✅ 通过" : "❌ 失败") + ", 找到 " + queryResult1.count + " 条记录"); sleep.second(2); // 测试7: 批量处理 Logger("INFO", "--- 测试7: 批量验证操作 ---"); var batchItems = [ { name: "Item1", value: 100 }, { name: "Item2", value: 200 }, { invalid: true }, // 无效项 { name: "Item3", value: 300 } ]; var batchResult = batchProcess(batchItems, "validate"); printl("批量处理结果: 成功 " + batchResult.summary.successful + " 个, 失败 " + batchResult.summary.failed + " 个"); sleep.second(2); Logger("INFO", "========== 测试用例执行完毕 =========="); } // ==================== 主程序入口 ==================== function main() { Logger("INFO", "========================================"); Logger("INFO", " JavaScript 高级错误处理实战示例 "); Logger("INFO", "========================================"); try { // 运行所有测试 runTests(); // 显示最终统计 Logger("INFO", "========================================"); Logger("INFO", " 执行总结"); Logger("INFO", "========================================"); Logger("INFO", "总用户数: " + mockDatabase.users.length); Logger("INFO", "总产品数: " + mockDatabase.products.length); Logger("INFO", "总订单数: " + mockDatabase.orders.length); Logger("INFO", "✅ 示例程序执行完成"); } catch (criticalError) { Logger("err", "程序发生严重错误", { error: criticalError.message, stack: criticalError.stack \|\| "无堆栈信息" }); } finally { Logger("INFO", "========================================"); Logger("INFO", " 程序执行结束"); Logger("INFO", "========================================"); printl("===== JavaScript 高级错误处理实战示例结束 ====="); printl("========== 脚本执行完毕 =========="); } } // 启动主程序 main(); 复制代码

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