JavaScript性能优化系列（Vue3+TypeScript）：第八章弱网环境体验优化

8.1 请求优先级：核心功能请求优先处理

8.1.1 引言：弱网下的“请求拥堵”痛点

在前端开发中，我们常聚焦于“正常网络”下的性能优化（如首屏加载、组件渲染），却容易忽视弱网环境的特殊性——这里的“弱网”并非仅指“2G/3G网络”，还包括地铁、电梯等信号不稳定区域，以及带宽被占用的家庭/办公网络（如多设备同时下载）。

弱网环境的核心问题是**“资源争夺”**：浏览器对同一域名的并发请求存在限制（通常为6个TCP连接），且网络带宽低、延迟高、丢包率高。若所有请求“无差别发起”，非核心请求（如推荐列表、用户行为统计）会占用有限的连接数和带宽，导致核心请求（如用户登录、商品支付、首屏关键数据）排队等待，最终表现为“用户想做的操作加载慢，不想看的内容先出来”，严重破坏用户体验。

本节将围绕**“请求优先级”** 展开，结合Vue3+TypeScript生态，从原理、反例、正确实践、代码评审四个维度，讲解如何让核心功能请求“插队”优先处理，解决弱网下的请求拥堵问题。

8.1.2 原理讲解：请求优先级的核心逻辑

要实现“核心请求优先”，需先理解其底层逻辑——本质是**“资源分配策略”**：在有限的网络资源下，优先将带宽、连接数分配给对用户体验影响最大的请求。我们需要从“请求分类”“浏览器机制”“Vue3生态适配”三个层面掌握原理。

1. 核心请求与非核心请求的区分标准

首先要明确：什么是“核心请求”？什么是“非核心请求”？这是优先级设计的前提，不同业务场景的划分标准不同，但核心原则是**“是否影响用户当前操作目标”**。

请求类型定义常见场景优先级

核心请求影响首屏渲染、用户当前操作目标、业务核心流程的请求 1. 首屏关键数据（如用户信息、页面标题、核心功能入口）

2. 用户主动操作触发的请求（如登录提交、支付下单、按钮点击后的数据加载）

3. 阻断后续操作的请求（如表单验证、权限校验） HIGH（高）

非核心请求不影响当前操作，可延迟加载或降级的请求 1. 非首屏内容（如页面底部的推荐列表、历史记录）

2. 统计类请求（如用户行为埋点、页面停留时长上报）

3. 可缓存的非关键数据（如商品评价、帮助文档内容） LOW（低）/ MEDIUM（中）

注意：优先级是“相对概念”，需结合业务场景动态调整。例如“商品详情页”中，“商品基本信息（名称、价格、库存）”是核心请求，“商品评价列表”是中等优先级，“同类商品推荐”是低优先级。

2. 浏览器原生的请求优先级机制

浏览器本身已具备“请求优先级调度”能力，前端可借助这些原生机制提升核心请求的优先级，避免重复造轮子。目前主流的原生能力有两种：

（1）Fetch API 的 priority 属性

Fetch API 支持通过 priority 参数显式设置请求优先级，浏览器会根据该值调整请求的调度顺序（高优先级请求优先进入网络队列）。该属性的取值范围如下：

high：高优先级，用于核心请求（如首屏数据、用户操作触发的请求）

low：低优先级，用于非核心请求（如统计、非首屏内容）

auto：默认值，浏览器根据请求类型自动判断（如 script/fetch 默认优先级中等，img 默认优先级低）

兼容性：Chrome 102+、Edge 102+、Firefox 113+，主流现代浏览器已支持；若需兼容旧浏览器，可通过“请求头标记+后端配合”降级。

（2）资源预加载（）

用于告知浏览器“提前加载关键资源”，浏览器会将预加载的资源视为高优先级，优先分配带宽。虽然它主要用于静态资源（如JS、CSS、图片），但也可用于“核心API数据”（通过预加载JSON资源实现）。

例如，预加载“用户信息”API数据：

rel="preload"

href="/api/v1/user/current"

as="fetch"

crossorigin="anonymous"

>

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3. Vue3+TypeScript 生态的适配逻辑

Vue3 本身不直接提供“请求优先级”能力，但可通过“组合式API+请求库（Axios/Fetch）+工具类”实现完整方案。核心适配逻辑如下：

请求分类：通过 TypeScript 枚举定义优先级，约束所有请求必须指定优先级；

拦截器注入：在 Axios 拦截器中，为不同优先级的请求添加标记（如自定义 Header X-Request-Priority），或适配 Fetch 的 priority 属性；

队列管理：实现“优先级队列”工具类，控制请求的发起顺序和并发数，确保高优先级请求先执行；

生命周期联动：结合 Vue3 的 onMounted、nextTick 等生命周期，在合适时机发起不同优先级的请求（如核心请求在 onMounted 早期发起，非核心请求延迟发起）。

8.1.3 实践反例：这些错误正在阻塞核心请求

在实际项目中，“请求优先级混乱”是弱网下体验差的主要原因之一。以下是三个典型反例，结合 Vue3+TypeScript 代码分析问题根源及后果。

反例1：所有请求无差别并发发起

场景：首页加载时，同时发起5个请求（用户信息、商品列表、推荐内容、公告、行为统计），未区分优先级。

代码实现（Vue3 SFC + TypeScript）：

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问题分析：

并发数超限：浏览器对同一域名的并发TCP连接限制为6个（不同浏览器略有差异）。若首页同时发起5个API请求，再加上图片、CSS、JS等静态资源请求，会导致部分请求进入“等待队列”；

优先级倒置：非核心请求（如推荐、统计）与核心请求（用户信息、商品列表）同时发起，若非核心请求先被分配到连接，核心请求会被阻塞，导致用户“看不到个人信息和商品，却先加载出推荐内容”；

无容错机制：弱网下非核心请求若超时或失败，可能阻塞后续代码执行（如统计请求失败导致其他逻辑中断，虽示例中用了await，但实际项目中常忽略错误处理）。

弱网下的后果：首页加载10+秒，核心内容（用户信息、商品列表）延迟显示，用户可能因“看不到关键内容”直接退出页面。

反例2：核心请求依赖非核心请求的结果

场景：商品详情页中，需要先加载“商品分类列表”（非核心），再加载“商品详情”（核心），导致详情加载延迟。

代码实现（Vue3 SFC + TypeScript）：

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问题分析：

逻辑依赖错误：商品详情是用户访问该页面的核心目标，分类列表仅用于“切换分类”，二者无逻辑依赖关系，不该让核心请求等待非核心请求；

串行阻塞：弱网下分类列表请求若延迟5秒，商品详情请求会被阻塞5秒后才发起，进一步延长核心内容的加载时间；

容错缺失：若分类列表请求失败（如接口报错），会直接导致商品详情请求无法发起，用户完全看不到核心内容。

弱网下的后果：用户进入详情页后，长时间看到空白或加载中状态，分类列表和详情都无法显示，严重影响转化（如用户想买商品却看不到详情）。

反例3：未利用浏览器原生优先级机制

场景：使用 Axios 发起核心请求时，未设置任何优先级标记，浏览器按“发起顺序”而非“重要性”调度请求。

代码实现（Axios 配置 + Vue3）：

// src/utils/request.ts（Axios 实例配置）

import axios from 'axios';

const request = axios.create({

baseURL: import.meta.env.VITE_API_BASE_URL,

timeout: 10000, // 所有请求统一超时时间

headers: {

'Content-Type': 'application/json'

}

});

// 未添加任何优先级相关配置

request.interceptors.request.use(

(config) => {

// 仅添加token，无优先级标记

const token = localStorage.getItem('token');

if (token) {

config.headers.Authorization = `Bearer ${token}`;

}

return config;

},

(error) => Promise.reject(error)

);

export default request;

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问题分析：

浏览器无法识别优先级：由于未设置 priority 或自定义 Header，浏览器会按“请求发起顺序”调度，若核心请求发起稍晚（如被其他逻辑延迟），会被后续请求阻塞；

前后端无协同：后端无法识别核心请求，只能按“接收顺序”处理，弱网下若核心请求在传输过程中延迟，后端会先处理非核心请求，进一步延长核心请求的响应时间；

超时时间一刀切：所有请求统一设置10秒超时，核心请求（如支付结果查询）需要更短的超时重试机制，非核心请求可容忍更长超时，统一配置会导致核心请求“该重试时不重试，该快速失败时不失败”。

弱网下的后果：用户支付后，长时间等待支付结果（核心请求被阻塞），而推荐商品（非核心）先加载出来，用户会因“不确定支付是否成功”产生焦虑，甚至重复支付。

8.1.4 正确实践：Vue3+TypeScript 实现请求优先级方案

针对上述反例，本节提供一套完整的“请求优先级”实践方案，涵盖“分类体系、队列管理、生命周期联动、原生API利用”四个核心环节，可直接在 Vue3+TypeScript 项目中复用。

步骤1：定义请求优先级分类体系（TypeScript 类型约束）

首先通过 TypeScript 枚举和接口，统一请求优先级的定义，确保所有请求必须指定优先级，避免“无优先级”的混乱场景。

代码实现（src/types/request.ts）：

/**

* 请求优先级枚举

* HIGH：核心请求（影响首屏、用户关键操作）

* MEDIUM：中等优先级（非核心但用户可见内容）

* LOW：低优先级（用户无感知、可延迟/降级的请求）

*/

export enum RequestPriority {

HIGH = 'high',

MEDIUM = 'medium',

LOW = 'low'

}

/**

* 带优先级的请求选项接口

* 扩展 AxiosRequestConfig，添加 priority 字段

*/

import type { AxiosRequestConfig } from 'axios';

export interface PriorityAxiosRequestConfig extends AxiosRequestConfig {

/** 请求优先级，必传 */

priority: RequestPriority;

/** 弱网下是否可中止，默认：LOW优先级可中止，HIGH不可中止 */

abortable?: boolean;

/** 超时时间（毫秒），默认：HIGH=5000，MEDIUM=8000，LOW=10000 */

timeout?: number;

}

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作用：

通过枚举约束优先级取值，避免随意定义（如“high”“HIGH”“高级”等不统一的写法）；

扩展 Axios 配置接口，强制所有请求必须传入 priority，TypeScript 会在编译阶段报错，减少 runtime 错误；

支持自定义 abortable（是否可中止）和 timeout（超时时间），实现差异化配置。

步骤2：实现优先级请求队列（控制发起顺序与并发）

弱网下若请求数量超过浏览器并发限制，需要通过“优先级队列”控制请求的发起顺序——高优先级请求先进入网络队列，低优先级请求等待或延迟发起。以下实现一个通用的优先级队列工具类。

代码实现（src/utils/requestPriorityQueue.ts）：

import type { PriorityAxiosRequestConfig } from '@/types/request';

import request from '@/utils/request'; // 后续步骤会配置的 Axios 实例

import { ref } from 'vue';

// 优先级权重：用于排序（权重越高，优先级越高）

const PRIORITY_WEIGHT = {

[RequestPriority.HIGH]: 3,

[RequestPriority.MEDIUM]: 2,

[RequestPriority.LOW]: 1

};

/**

* 请求优先级队列类

* 功能：按优先级排序请求、控制并发数、弱网下中止低优先级请求

*/

export class RequestPriorityQueue {

// 队列存储：二维数组，[权重, 请求配置, 中止控制器]

private queue: [number, PriorityAxiosRequestConfig, AbortController][] = [];

// 当前并发数

private currentConcurrency = 0;

// 最大并发数（弱网下建议设为3，正常网络可设为5）

private maxConcurrency = 3;

// 网络状态（是否为弱网）

public isWeakNetwork = ref(false);

constructor() {

// 监听网络状态变化（判断是否为弱网）

this.listenNetworkStatus();

}

/**

* 监听网络状态：通过 navigator.connection 判断

* effectiveType 为 '2g'/'slow-2g' 时视为弱网

*/

private listenNetworkStatus() {

if (!navigator.connection) return; // 兼容不支持的浏览器

const updateNetworkStatus = () => {

const effectiveType = navigator.connection.effectiveType;

this.isWeakNetwork.value = ['2g', 'slow-2g'].includes(effectiveType);

// 弱网下降低最大并发数

this.maxConcurrency = this.isWeakNetwork.value ? 3 : 5;

// 弱网时，中止所有未执行的低优先级请求

if (this.isWeakNetwork.value) {

this.abortLowPriorityRequests();

}

};

// 初始判断

updateNetworkStatus();

// 网络状态变化时更新

navigator.connection.addEventListener('change', updateNetworkStatus);

}

/**

* 添加请求到队列

* @param config 带优先级的请求配置

* @returns Promise<响应数据>

*/

add(config: PriorityAxiosRequestConfig): Promise {

return new Promise((resolve, reject) => {

// 1. 补全默认配置（超时时间、是否可中止）

const completeConfig = this.completeDefaultConfig(config);

// 2. 创建中止控制器（用于弱网下中止请求）

const controller = new AbortController();

completeConfig.signal = controller.signal;

// 3. 计算权重，添加到队列

const weight = PRIORITY_WEIGHT[completeConfig.priority];

this.queue.push([weight, completeConfig, controller]);

// 4. 对队列排序（权重降序，相同权重按添加顺序）

this.queue.sort((a, b) => {

if (a[0] !== b[0]) {

return b[0] - a[0]; // 权重高的在前

} else {

return 0; // 相同权重按添加顺序

}

});

// 5. 执行队列

this.runQueue(resolve, reject);

});

}

/**

* 补全请求的默认配置

*/

private completeDefaultConfig(

config: PriorityAxiosRequestConfig

): PriorityAxiosRequestConfig {

return {

// 默认超时时间：HIGH=5s，MEDIUM=8s，LOW=10s

timeout: config.timeout || {

[RequestPriority.HIGH]: 5000,

[RequestPriority.MEDIUM]: 8000,

[RequestPriority.LOW]: 10000

}[config.priority],

// 默认是否可中止：LOW可中止，其他不可中止

abortable: config.abortable ?? config.priority === RequestPriority.LOW,

...config

};

}

/**

* 执行队列：控制并发数，发起请求

*/

private async runQueue(resolve: (data: T) => void, reject: (err: any) => void) {

// 若当前并发数已达上限，或队列为空，直接返回

if (this.currentConcurrency >= this.maxConcurrency || this.queue.length === 0) {

return;

}

// 1. 取出队列头部的请求（优先级最高）

const [_, config, controller] = this.queue.shift()!;

this.currentConcurrency++;

try {

// 2. 发起请求（使用配置好的 Axios 实例）

const response = await request(config);

resolve(response.data);

} catch (error: any) {

// 3. 错误处理：核心请求重试，非核心请求直接 reject

if (config.priority === RequestPriority.HIGH && !error.name.includes('AbortError')) {

// 核心请求重试1次

const retryResponse = await request(config);

resolve(retryResponse.data);

} else {

reject(error);

}

} finally {

// 4. 请求完成后，并发数减1，继续执行队列

this.currentConcurrency--;

this.runQueue(resolve, reject);

}

/**

* 弱网时中止所有未执行的低优先级请求

*/

private abortLowPriorityRequests() {

this.queue = this.queue.filter(([weight, config, controller]) => {

// 仅保留高/中优先级请求，中止低优先级且可中止的请求

if (config.priority === RequestPriority.LOW && config.abortable) {

controller.abort(); // 中止请求

return false; // 从队列中移除

}

return true;

});

}

/**

* 清空队列（如页面卸载时）

*/

clear() {

this.queue.forEach(([_, __, controller]) => {

controller.abort();

});

this.queue = [];

this.currentConcurrency = 0;

}

// 创建全局队列实例（单例模式，避免重复创建）

export const requestQueue = new RequestPriorityQueue();

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核心功能解析：

队列排序：通过“权重”对请求排序，高优先级请求（HIGH）始终在队列头部；

并发控制：弱网下最大并发数设为3，避免请求拥堵；

网络状态监听：通过 navigator.connection 判断是否为弱网，弱网时自动中止未执行的低优先级请求；

差异化容错：核心请求（HIGH）失败后重试1次，非核心请求不重试，减少无效网络开销；

单例模式：全局共享一个队列实例，确保所有请求统一调度。

步骤3：配置 Axios 实例（注入优先级标记）

在 Axios 拦截器中，为不同优先级的请求添加“优先级标记”（自定义 Header 和 Fetch 优先级），实现“前后端协同”和“浏览器原生调度”。

代码实现（src/utils/request.ts）：

import axios from 'axios';

import type { PriorityAxiosRequestConfig } from '@/types/request';

import { RequestPriority } from '@/types/request';

// 创建 Axios 实例

const request = axios.create({

baseURL: import.meta.env.VITE_API_BASE_URL,

headers: {

'Content-Type': 'application/json'

}

});

// 请求拦截器：注入优先级标记

request.interceptors.request.use(

(config: PriorityAxiosRequestConfig) => {

// 1. 必传优先级校验（TypeScript 编译时已约束，此处为 runtime 兜底）

if (!config.priority) {

throw new Error('请求必须指定 priority（RequestPriority）');

}

// 2. 添加自定义 Header：告知后端请求优先级

config.headers['X-Request-Priority'] = config.priority;

// 3. 适配 Fetch API 的 priority 属性（若使用 Fetch 适配器）

// 注：Axios 默认使用 XMLHttpRequest，需替换为 Fetch 适配器才能支持 priority

if (config.adapter === 'fetch') {

(config as any).priority = config.priority; // 传递 priority 到 Fetch

}

// 4. 添加 Token（常规操作）

const token = localStorage.getItem('token');

if (token) {

config.headers.Authorization = `Bearer ${token}`;

}

return config;

},

(error) => Promise.reject(error)

);

// 响应拦截器：统一错误处理

request.interceptors.response.use(

(response) => response,

(error) => {

// 过滤中止错误（弱网下主动中止的低优先级请求）

if (error.name === 'AbortError') {

console.log('请求已中止（低优先级，弱网环境）', error.config.url);

return Promise.reject(new Error('请求已中止（弱网优化）'));

}

// 其他错误统一处理（如 Token 过期、服务器错误）

console.error('请求错误', error);

return Promise.reject(error);

}

);

// 导出带优先级的请求方法（覆盖默认的 get/post 等方法）

export default {

get(url: string, config: PriorityAxiosRequestConfig): Promise {

return request.get(url, config);

},

post(url: string, data?: any, config: PriorityAxiosRequestConfig): Promise {

return request.post(url, data, config);

},

put(url: string, data?: any, config: PriorityAxiosRequestConfig): Promise {

return request.put(url, data, config);

},

delete(url: string, config: PriorityAxiosRequestConfig): Promise {

return request.delete(url, config);

}

};

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关键配置说明：

自定义 Header X-Request-Priority：后端可通过该 Header 优先处理高优先级请求（如调整后端接口的线程池优先级）；

Fetch 适配器适配：若项目需要使用 Fetch API（而非 XMLHttpRequest），可通过 axios-fetch-adapter 替换 Axios 适配器，从而支持 priority 属性；

错误过滤：主动过滤“弱网下中止低优先级请求”的错误，避免前端错误监控误报。

步骤4：Vue3 组件中使用（结合生命周期）

在 Vue3 组件中，通过“优先级队列”发起请求，并结合 onMounted、nextTick、用户交互事件，在合适时机发起不同优先级的请求。

示例1：首页加载（核心请求优先，非核心延迟）

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核心优化点：

请求时机分层：

onMounted 早期：发起高优先级核心请求（用户信息、商品列表）；

核心请求完成后：发起中等优先级请求（公告）；

nextTick 后：发起低优先级的推荐列表（确保核心内容先渲染）；

最后：发起无感知的统计请求；

并行与串行结合：核心请求（用户信息、商品列表）并行发起，非核心请求串行延迟，平衡加载速度和资源占用；

页面卸载清理：onUnmounted 中调用 requestQueue.clear()，中止未完成的请求，避免内存泄漏和无效请求。

示例2：商品详情页（核心请求不依赖非核心）

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核心优化点：

解除错误依赖：商品详情（核心）不依赖分类列表（非核心），独立发起，避免串行阻塞；

核心请求超时缩短：商品详情超时设为3秒，比默认的5秒更短，确保快速失败后重试（符合用户“等待详情的迫切需求”）；

非核心请求并行：分类和推荐列表在核心请求完成后并行发起，减少非核心内容的加载时间。

步骤5：利用浏览器原生API（preload + Fetch priority）

对于“超核心”的请求（如首屏关键数据、用户登录状态），可结合和 Fetch 的 priority 属性，进一步提升优先级，确保浏览器优先调度。

示例：首屏关键数据预加载

Vue3 性能优化示例

rel="preload"

href="/api/v1/user/current"

as="fetch"

crossorigin="anonymous"

id="preload-user-info"

>

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核心优化点：

预加载提前发起：在 HTML 解析阶段就发起请求，比 onMounted 中的请求更早，弱网下可节省数百毫秒；

双保险机制：先检查 preload 结果，未完成则通过队列发起高优先级请求，避免预加载失败导致核心数据缺失；

Fetch priority 加持：使用 Fetch 适配器并设置 priority: 'high'，浏览器会将该请求标记为“最高优先级”，优先分配带宽。

8.1.5 代码评审要点：如何确保请求优先级落地

代码评审（Code Review）是确保“请求优先级”方案落地的关键环节。以下是针对本节内容的评审要点，可作为团队评审的 checklist。

1. 优先级分类是否清晰

检查点：所有请求是否指定了 priority（HIGH/MEDIUM/LOW），无“未指定优先级”的请求；

检查方法：搜索代码中 requestQueue.add 或 request.get/post 的调用，确认每个请求都传入了 priority 参数；

标准：核心请求（如首屏关键数据、用户操作触发）必须设为 HIGH，非核心请求（如推荐、统计）设为 LOW，无“核心请求设为 LOW”或“非核心请求设为 HIGH”的情况。

2. 请求时机是否合理

检查点：核心请求是否在 onMounted 早期发起，非核心请求是否延迟发起（如 nextTick 后、用户交互后）；

检查方法：查看组件的 onMounted 生命周期函数，确认核心请求无“等待非核心请求”的串行逻辑；

标准：核心请求不依赖非核心请求的结果，非核心请求不阻塞核心请求的发起，无“反例2”中的错误依赖。

3. 队列与并发控制是否生效

检查点：是否使用 requestQueue 发起请求，而非直接调用 Axios 实例；弱网下是否会中止低优先级请求；

检查方法：

模拟弱网（Chrome DevTools → Network → Throttling → 2G）；

查看控制台日志，确认低优先级请求是否被标记为“请求已中止（弱网优化）”；

查看 Network 面板，确认并发请求数不超过3个；

标准：弱网下低优先级且 abortable: true 的请求会被中止，并发数控制在3以内，无“无差别并发”的情况。

4. 浏览器原生API是否利用

检查点：核心请求是否使用 preload 或 Fetch 的 priority 属性；

检查方法：

查看 index.html，确认首屏超核心数据是否有；

查看 Network 面板，点击核心请求，在“Request Headers”中确认是否有 priority: high（Fetch 请求）或 X-Request-Priority: high（Axios 请求）；

标准：超核心请求（如用户信息）使用 preload，核心 Fetch 请求设置 priority: high，无“核心请求未利用原生优化”的情况。

5. 错误处理与清理是否完善

检查点：核心请求是否有重试机制，页面卸载时是否清空队列；

检查方法：

模拟核心请求失败（Chrome DevTools → Network → 右键请求 → Block request domain）；

查看控制台日志，确认核心请求是否重试1次；

切换路由（页面卸载），查看 Network 面板，确认未完成的请求是否被中止；

标准：核心请求失败后重试1次，页面卸载时队列被清空，无“核心请求不重试”或“页面卸载后请求仍在执行”的情况。

8.1.6 对话小剧场：团队如何讨论请求优先级优化

场景：某电商项目迭代会议，测试反馈“弱网下首页加载慢，用户信息和商品列表延迟显示”，团队讨论解决方案。

人物：

小美（前端开发，负责首页）：“最近测试反馈，弱网下首页要等10多秒才能看到用户信息和商品列表，推荐内容反而先出来了，这是怎么回事啊？”

小迪（前端开发，负责商品模块）：“我看了下你首页的代码，onMounted 里同时发了5个请求，包括用户信息、商品列表、推荐、公告、统计，所有请求一起发，弱网下肯定堵了！浏览器同一域名只能6个并发，要是再加上图片、CSS，API请求就排队了，推荐这种非核心请求可能先占了连接，核心请求就卡了。”

小稳（资深前端，技术负责人）：“小迪说的对，这就是‘请求无优先级’的问题。我们之前定义过 RequestPriority 枚举，你是不是没给请求加优先级？而且没用到 requestQueue 队列，所有请求无差别并发，弱网下肯定出问题。”

小美：“啊，我忘了加优先级了！那现在该怎么改？”

小稳：“首先，你要把请求分个类：用户信息、商品列表是核心，设为 HIGH；公告是中等，设为 MEDIUM；推荐、统计是非核心，设为 LOW。然后用 requestQueue.add 发起请求，而不是直接调用 Axios。”

大熊（后端开发）：“对了，我们后端已经支持 X-Request-Priority Header 了，你们前端把这个 Header 带上，后端会优先处理高优先级请求，响应速度能快一点。”

小燕（质量工程师）：“我测试的时候还发现，有时候商品详情页要等分类列表加载完才显示详情，这是不是依赖错了？弱网下分类列表加载慢，详情就一直空白。”

小迪（负责商品详情页）：“那个是我之前写的，当时想先加载分类再加载详情，没想到分类是非核心的。我现在就改，让详情请求独立发起，设为 HIGH，分类列表等详情加载完再发，设为 MEDIUM。”

小稳：“还有，首屏的用户信息可以用预加载，HTML 解析的时候就发起请求，比 onMounted 早很多。弱网下 requestQueue 会自动中止低优先级请求，并发数控制在3个，避免拥堵。”

小美：“那我现在就按这个方案改：给所有请求加优先级，用 requestQueue 发起，核心请求在 onMounted 早期发，非核心延迟发，再加上 preload 预加载用户信息。改完后怎么验证呢？”

小燕：“我来帮你验证！用 Chrome DevTools 模拟2G网络，看核心请求是不是先发起，响应时间是不是比非核心短，并发数是不是不超过3个。另外，还要测试页面切换时，未完成的请求会不会被中止，避免内存泄漏。”

大熊：“后端这边也会配合，优先处理 X-Request-Priority: high 的请求，确保前后端一起优化，效果更好。”

小稳：“好，那就这么定了！小美负责首页的请求优先级调整，小迪负责商品详情页的依赖解除，改完后小燕重点测试弱网场景，确保核心内容优先显示。”

8.1.7 小结

本节围绕“弱网环境下核心功能请求优先处理”展开，核心是通过“分类体系+队列管理+生命周期联动+原生API利用”，解决“请求拥堵”问题。关键要点如下：

原理层面：弱网下请求并发受限，需通过优先级区分核心与非核心请求，借助浏览器原生机制和队列控制提升核心请求的调度优先级；

实践层面：通过 TypeScript 枚举约束优先级，用 RequestPriorityQueue 控制请求顺序和并发，结合 Vue3 生命周期在合适时机发起请求，利用 preload 和 Fetch priority 进一步优化；

评审层面：重点检查优先级分类、请求时机、队列控制、原生API利用、错误处理，确保方案落地；

————————————————

原文链接：https://blog.csdn.net/weixin_42288219/article/details/154072897

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