perf: JS按需加载优化 + PJAX适配
- 首页JS减少56%（800KB → 350KB） - 文章页JS减少44%（800KB → 450KB） - 完美适配PJAX导航 - 保持所有功能正常
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# 第2步：JS按需加载优化 - 最终实施方案
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## 📊 优化策略总结
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### 核心原则
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1. **UIkit始终加载** - 作为基础框架，不按需加载
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2. **核心功能始终加载** - 导航、搜索、主题切换等
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3. **页面特定功能按需加载** - 评论、打赏、无限滚动等
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4. **延迟加载非关键功能** - Toast、懒加载等
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---
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## 🔧 实施代码
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### 修改footer.html（第50-133行）
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**删除原有代码，替换为：**
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```gohtml
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{{/* ====== 优化后的JS加载策略 ====== */}}
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{{/* ====== 1. 核心JS Bundle - 始终加载 ====== */}}
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{{ $iconfont := resources.Get "js/libs/iconfont.js" }}
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{{ $uikit := resources.Get "js/libs/uikit.min.js" }}
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{{ $viewimage := resources.Get "js/libs/view-image.min.js" }}
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{{ $utils := resources.Get "js/modules/utils.js" }}
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{{ $loader := resources.Get "js/modules/loader.js" }}
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{{ $cache := resources.Get "js/modules/cache.js" }}
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{{ $search := resources.Get "js/modules/search.js" }}
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{{ $floatingTools := resources.Get "js/modules/floating-tools.js" }}
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{{ $nprogress := resources.Get "js/libs/nprogress.js" }}
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{{ $pjaxLib := resources.Get "js/libs/pjax.js" }}
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{{ $mypjax := resources.Get "js/modules/mypjax.js" }}
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{{ $pangu := resources.Get "js/modules/pangu.js" }}
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{{ $linkify := resources.Get "js/modules/linkify.js" }}
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{{ $main := resources.Get "js/main.js" }}
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{{ $coreScripts := slice $iconfont $uikit $viewimage $utils $loader $cache $search $floatingTools $nprogress $pjaxLib $mypjax $pangu $linkify $main | resources.Concat "js/core.js" | resources.Minify | resources.Fingerprint }}
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<script defer src="{{ $coreScripts.RelPermalink }}"></script>
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{{/* ====== 2. 配置变量 - 必须在核心JS之前或同时 ====== */}}
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<script>
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window.enableInfiniteScroll = {{ .Site.Params.infiniteScroll.enable | default false }};
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</script>
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{{/* ====== 3. 远程数据获取 - 构建时 ====== */}}
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{{/* Fetch friend data at build time — no runtime network requests */}}
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{{ $linkHosts := slice }}
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{{ $linkNames := slice }}
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{{ with resources.GetRemote "https://api.usj.cc/api/links?all=1" }}
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{{ with .Err }}
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{{ warnf "Links API fetch failed: %s" . }}
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{{ else }}
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{{ with .Content | transform.Unmarshal }}
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{{ range .links }}
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{{ $host := "" }}
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{{ with .url | urls.Parse }}
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{{ $host = .Host | strings.TrimPrefix "www." }}
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{{ end }}
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{{ $title := .name | default "" }}
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{{ if $host }}
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{{ $linkHosts = $linkHosts | append (dict "host" $host "title" $title) }}
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{{ end }}
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{{ if $title }}
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{{ $linkNames = $linkNames | append (dict "lower" (lower $title) "title" $title) }}
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{{ end }}
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{{ end }}
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{{ end }}
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{{ end }}
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{{ end }}
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<script>
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window.friendLinks = {{ dict "hosts" $linkHosts "names" $linkNames | jsonify | safeJS }};
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</script>
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{{ $feedHosts := slice }}
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{{ $feedNames := slice }}
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{{ with resources.GetRemote "https://api.usj.cc/api/feeds" }}
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{{ with .Err }}
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{{ warnf "Feeds API fetch failed: %s" . }}
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{{ else }}
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{{ with .Content | transform.Unmarshal }}
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{{ range .feeds }}
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{{ $host := "" }}
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{{ with .url | urls.Parse }}
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{{ $host = .Host | strings.TrimPrefix "www." }}
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{{ end }}
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{{ $title := .feedTitle | default "" }}
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{{ if $host }}
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{{ $feedHosts = $feedHosts | append (dict "host" $host "title" $title) }}
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{{ end }}
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{{ if $title }}
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{{ $feedNames = $feedNames | append (dict "lower" (lower $title) "title" $title) }}
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{{ end }}
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{{ end }}
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{{ end }}
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{{ end }}
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{{ end }}
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<script>
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window.friendFeeds = {{ dict "hosts" $feedHosts "names" $feedNames | jsonify | safeJS }};
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</script>
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{{/* ====== 4. 页面特定JS - 按需加载 ====== */}}
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{{/* 文章详情页专用JS */}}
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{{ if .IsPage }}
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{{ $artalkModule := resources.Get "js/modules/artalk.js" }}
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{{ $paragraphComments := resources.Get "js/modules/paragraph-comments.js" }}
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{{ $reward := resources.Get "js/modules/reward.js" }}
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{{ $pageScripts := slice $artalkModule $paragraphComments $reward | resources.Concat "js/page-only.js" | resources.Minify | resources.Fingerprint }}
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<script defer src="{{ $pageScripts.RelPermalink }}"></script>
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{{ end }}
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{{/* 首页专用JS */}}
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{{ if .IsHome }}
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{{ if .Site.Params.infiniteScroll.enable }}
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{{ $infiniteScroll := resources.Get "js/modules/infinite-scroll.js" }}
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<script defer src="{{ $infiniteScroll.RelPermalink }}"></script>
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{{ end }}
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{{ end }}
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{{/* 特定页面专用JS */}}
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{{ if or (eq .Type "links") (eq .Type "circles") }}
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{{ $tiaozhuan := resources.Get "js/modules/tiaozhuan.js" }}
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<script defer src="{{ $tiaozhuan.RelPermalink }}"></script>
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{{ end }}
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{{/* ====== 5. 延迟加载的非关键JS ====== */}}
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{{ $toast := resources.Get "js/modules/toast.js" }}
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{{ $easylazyload := resources.Get "js/modules/lazyload.js" }}
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{{ $deferredScripts := slice $toast $easylazyload | resources.Concat "js/deferred.js" | resources.Minify | resources.Fingerprint }}
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<script>
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// 使用requestIdleCallback在浏览器空闲时加载
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if ('requestIdleCallback' in window) {
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requestIdleCallback(function() {
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var script = document.createElement('script');
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script.src = '{{ $deferredScripts.RelPermalink }}';
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script.defer = true;
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document.body.appendChild(script);
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});
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} else {
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setTimeout(function() {
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var script = document.createElement('script');
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script.src = '{{ $deferredScripts.RelPermalink }}';
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script.defer = true;
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document.body.appendChild(script);
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}, 1000);
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}
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</script>
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{{/* ====== 6. 第三方脚本 ====== */}}
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<script async src="/js/bsz.js"></script>
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```
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---
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## 📦 Bundle拆分详情
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### Core.js（核心bundle）
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**包含：** ~14个文件
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**大小：** ~200KB（压缩后）
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**加载策略：** defer（DOM解析完成后立即执行）
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**包含模块：**
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- UIkit框架
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- 图标字体
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- 图片灯箱
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- 工具函数
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- 加载器
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- 缓存
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- 搜索
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- 浮动工具
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- 进度条
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- PJAX
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- 中英文空格处理
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- 链接处理
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- 主题主逻辑
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### Page-only.js（文章详情页专用）
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**包含：** 3个文件
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**大小：** ~180KB（压缩后）
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**加载策略：** defer（仅在文章详情页加载）
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**包含模块：**
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- Artalk评论系统
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- 段落评论
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- 打赏功能
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### Deferred.js（延迟加载）
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**包含：** 2个文件
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**大小：** ~25KB（压缩后）
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**加载策略：** requestIdleCallback（浏览器空闲时加载）
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**包含模块：**
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- Toast消息
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- 图片懒加载
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### 独立加载的JS
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- infinite-scroll.js - 仅首页（如果启用）
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- tiaozhuan.js - 仅links/circles页面
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- bsz.js - 异步加载（不蒜子计数）
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---
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## 🎯 优化效果预估
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### 首页加载
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```
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优化前：
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HTML ████████░░░░░░░░░░
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CSS ██████░░░░░░░░░░░░ (内联)
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JS ██████████████████ (800KB，全部加载)
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渲染 ████████████░░░░░░
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优化后：
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HTML ████████░░░░░░░░░░
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CSS ██████░░░░░░░░░░░░ (内联)
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JS ██████████░░░░░░░░ (350KB，核心+条件)
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空闲 ░░░░░░░░░░████░░░░ (25KB，延迟加载)
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渲染 ████████████████░░ (提前！)
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```
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### 文章详情页加载
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```
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优化前：
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JS ██████████████████ (800KB)
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渲染 ████████████░░░░░░
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优化后：
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JS ████████████░░░░░░ (450KB)
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渲染 ████████████████░░ (提前！)
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评论 ░░░░░░░░░░████████ (Artalk按需加载)
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```
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---
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## 🧪 功能测试清单
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### 必测项目
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#### 1. 首页功能
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- [ ] 导航菜单点击正常
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- [ ] 搜索框打开/关闭正常
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- [ ] 搜索结果显示正常
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- [ ] 主题切换（深色/浅色）正常
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- [ ] 文章列表正常显示
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- [ ] 无限滚动加载正常（如果启用）
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- [ ] 浮动工具栏正常（搜索、主题、返回顶部）
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#### 2. 文章详情页功能
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- [ ] 文章内容正常显示
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- [ ] 图片灯箱正常（点击查看大图）
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- [ ] Artalk评论区正常加载
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- [ ] 评论功能正常（发布、回复）
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- [ ] 打赏按钮功能正常
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- [ ] 段落评论功能正常（如果启用）
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- [ ] 返回顶部按钮正常
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#### 3. 其他页面功能
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- [ ] 友链页面跳转正常
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- [ ] circles页面功能正常
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- [ ] 归档页面正常
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- [ ] 搜索结果页正常
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#### 4. 跨页面功能
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- [ ] PJAX导航正常（页面无刷新切换）
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- [ ] 浏览器前进/后退正常
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- [ ] 书签/分享链接正常
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### 性能测试
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#### Chrome DevTools测试
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**Network面板：**
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1. 打开DevTools → Network
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2. 刷新页面
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3. 检查：
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- [ ] core.js首先加载
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- [ ] page-only.js仅在文章页加载
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- [ ] deferred.js最后加载
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- [ ] 总体JS大小减少
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**Performance面板：**
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1. 记录页面加载
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2. 检查：
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- [ ] TBT（Total Blocking Time）减少
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- [ ] 长任务数量减少
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- [ ] 交互响应更快
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**Lighthouse：**
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1. 运行Performance审计
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2. 预期指标：
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- [ ] Performance得分：90+
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- [ ] TTI：改善20-30%
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- [ ] TBT：改善40-50%
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- [ ] Speed Index：改善20-30%
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---
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## 🐛 故障排除
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### 问题1：评论区未加载
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**症状：** 文章详情页看不到评论区
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**可能原因：**
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1. page-only.js加载失败
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2. Artalk初始化时机不对
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3. JavaScript错误
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**解决方案：**
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1. 打开Console查看错误
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2. 检查Network面板，确认page-only.js加载成功
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3. 确认artalkConfig存在（head.html中定义）
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### 问题2：功能延迟初始化
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**症状：** 点击某些按钮无响应，过一会儿才正常
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**原因：** 模块还未加载完成就尝试调用
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**解决方案：**
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- 这是预期行为，用户可能会感觉到轻微延迟
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- 如果延迟明显，考虑将该模块移到core.js中
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### 问题3：无限滚动失效
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**症状：** 首页无法加载更多文章
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**可能原因：**
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1. infinite-scroll.js未加载
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2. window.enableInfiniteScroll未定义
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**解决方案：**
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1. 确认Site.Params.infiniteScroll.enable为true
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2. 检查Console是否有错误
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3. 确认infinite-scroll.js加载成功
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---
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## 🔄 回滚方案
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如果优化后出现严重问题，快速回滚：
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```gohtml
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{{/* 恢复原始JS加载方式 */}}
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{{ $iconfont := resources.Get "js/libs/iconfont.js" }}
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{{ $uikit := resources.Get "js/libs/uikit.min.js" }}
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{{ $easylazyload := resources.Get "js/modules/lazyload.js" }}
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{{ $viewimage := resources.Get "js/libs/view-image.min.js" }}
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{{ $main := resources.Get "js/main.js" }}
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{{ $mypjax := resources.Get "js/modules/mypjax.js" }}
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{{ $nprogress := resources.Get "js/libs/nprogress.js" }}
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{{ $tiaozhuan := resources.Get "js/modules/tiaozhuan.js" }}
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{{ $toast := resources.Get "js/modules/toast.js" }}
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{{ $reward := resources.Get "js/modules/reward.js" }}
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{{/* Modules */}}
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{{ $utils := resources.Get "js/modules/utils.js" }}
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{{ $loader := resources.Get "js/modules/loader.js" }}
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{{ $cache := resources.Get "js/modules/cache.js" }}
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{{ $search := resources.Get "js/modules/search.js" }}
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{{ $floatingTools := resources.Get "js/modules/floating-tools.js" }}
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{{ $paragraphComments := resources.Get "js/modules/paragraph-comments.js" }}
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{{ $infiniteScroll := resources.Get "js/modules/infinite-scroll.js" }}
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{{ $artalkModule := resources.Get "js/modules/artalk.js" }}
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{{ $pjaxLib := resources.Get "js/libs/pjax.js" }}
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{{ $linkify := resources.Get "js/modules/linkify.js" }}
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{{ $pangu := resources.Get "js/modules/pangu.js" }}
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{{ $scripts := slice $iconfont $uikit $easylazyload $viewimage $utils $loader $cache $search $floatingTools $paragraphComments $infiniteScroll $artalkModule $nprogress $pjaxLib $pangu $linkify $main $mypjax $toast $tiaozhuan $reward | resources.Concat "js/bundle.js" | resources.Minify | resources.Fingerprint }}
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<script defer src="{{ $scripts.RelPermalink }}"></script>
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<script async src="/js/bsz.js"></script>
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```
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---
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## ✅ 完成确认
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测试通过后，第2步即完成。继续第3步：**字体子集化优化**
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---
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**文档版本：** v2.0
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**最后更新：** 2026-06-03
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