# 前言

众所周知,jsdelivr在国内的速度可以用慢的一批来形容
而shoka主题使用了jsdelivr的combine功能加载第三方js,而combine在国内没有镜像源
并且阻断了使用CDN并发加速的道路,本篇博文会将jsdelivr聚合拆分为几个独立的js,以便使用国内镜像源和异步加载

# 拆分jsdelivr

# 更改模板

打开shoka\layout\_partials\layout.njk,找到第144行左右:

<script src="https://cdn.polyfill.io/v3/polyfill.js"></script>
&#123;{ _vendor_js() }&#125;
&#123;{ _js('app.js')}&#125;
&#123;{ partial('_partials/third-party/baidu-analytics.njk', {}, {cache: true}) }&#125;

更改为如下内容:

<script src="https://cdn.polyfill.io/v3/polyfill.js"></script>
&#123;%- if theme.advVendors.enable %&#125;
	&#123;% for i in _list_vendor_js() %&#125;
		&#123;{ _adv_vendor_js(i) }&#125;
	&#123;% endfor %&#125;
&#123;%- else %&#125;
&#123;{ _vendor_js() }&#125;
&#123;%- endif %&#125;
&#123;{ _js('app.js')}&#125;
&#123;{ partial('_partials/third-party/baidu-analytics.njk', {}, {cache: true}) }&#125;

# 注册helper

打开shoka\scripts\helpers\asset.js,最后一行新建空行,增加如下内容:

hexo.extend.helper.register('_list_vendor_js', () => {
    return hexo.theme.config.vendorsList.js;
});

hexo.extend.helper.register('_adv_vendor_js', function (js_name) {
    const config = hexo.theme.config.advVendors.js[js_name];
    const src = config["src"];
    let result;
    if (src.indexOf("http") !== -1) {
        result = src;
    } else if (src.indexOf("combine") !== -1) {
        console.log("The combine feature is not recommended!")
        result = hexo.theme.config.advVendors.combine + src;
    } else if (src.indexOf("npm") !== -1) {
        result = hexo.theme.config.advVendors.npm + src.slice(4);
    } else if (src.indexOf("gh") !== -1) {
        result = hexo.theme.config.advVendors.github + src.slice(3);
    } else {
        result = "/" + src;
    }
    let attr = {src: result};
    if (config["async"]) attr["async"] = "async";
    if (config["data-pjax"]) attr["data-pjax"] = "data-pjax";
    if (config["hash-value"]) attr["integrity"]=config["hash-value"];
    if (config["deferLoad"]) {
        return htmlTag('script', {"data-pjax": true}, `
        const script=document.createElement("script");script.src="${result}",script.async=true,document.body.appendChild(script)
        `)
    }
    return htmlTag('script', attr, '');
})

# 更改配置

在shoka目录下_config.yml增加如下内容:

advVendors:
  enable: true
  github: "https://cdn.jsdelivr.net/gh/"
  combine: "https://cdn.jsdelivr.net/"
  npm: "https://unpkg.com/"
  js:
    pace:
      src: https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/pace/1.0.2/pace.min.js
    pjax:
      src: https://lib.baomitu.com/pjax/0.2.8/pjax.min.js
    fetch:
      src: npm/whatwg-fetch@3.4.0/dist/fetch.umd.js
    anime:
      src: https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/animejs/3.2.0/anime.min.js
    algolia:
      src: https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/algoliasearch/4.12.1/algoliasearch-lite.umd.min.js
    instantsearch:
      src: https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/instantsearch.js/4.39.0/instantsearch.production.min.js
    lazyload:
      src: https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/lozad.js/1.16.0/lozad.min.js
    quicklink:
      src: https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/quicklink/2.2.0/quicklink.umd.min.js
    fancybox:
      src: https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/??jquery/3.5.1/jquery.min.js,fancybox/3.5.7/jquery.fancybox.min.js,justifiedGallery/3.8.1/js/jquery.justifiedGallery.min.js
      async: true
    copy_tex:
      src: https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/KaTeX/0.12.0/contrib/copy-tex.min.js
      async: true
    chart:
      src: npm/frappe-charts@1.5.0/dist/frappe-charts.min.iife.js

vendorsList:
  js:
    - pace
    - pjax
    - fetch
    - anime
    - algolia
    - instantsearch
    - lazyload
    - quicklink
    - fancybox
    - copy_tex
    - chart

下面为结构详解:

advVendors:
	enable: true #是否开启,关闭使用主题默认加载
	github: #github使用的加载源,需要协议头和末尾斜杠
	combine: #聚合js使用的加载源(不建议使用)
	npm: #npm的加载源
	js:
		jspackage: #js名,可以与文件名不一致
			src: "资源地址,详情见后面"
			# async: true 异步加载此js
			# data-pjax: true 在pjax加载时刷新此js
			# hash-value: 这个资源的integrity值,用于防XXS
			# deferLoad: true 使用动态DOM节点添加延迟js加载(实验性)

vendorsList:
  js:
  	- jspackage #与上方jspackage一致即可

资源地址格式如下:

• https://example.com/xxx.js 使用http(s)地址加载js
• combine/xxx.js,xxx.js使用jsdelivr的combine功能加载(不推荐)
• npm/xxx/xxx.js使用npm源加载js
• gh/xxx/xxx.js使用gh源加载js
• xxx.js从本地加载js
  优先级如下:
  http>combine>npm>gh>本地