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博客使用 waline 评论系统

发表于 更新于 Disqus：
本文字数： 6.4k 阅读时长 ≈ 6 分钟

之前博客的评论系统只支持 Disqus 评论系统。但是这个评论系统在墙内无法使用。为了方便交流，琢磨着怎么也得用上一个不用梯子也能使用的评论系统。又是一番搜索折腾最后还是决定使用 waline。

版本

本文使用的版本：

  • Hexo v5.4.0
  • NexT v8.8.2

安装配置 waline 和 Vercel

安装配置参考了这篇文章：Hexo使用Waline评论系统 。文章的中官方链接和指南都解释得比较详细，按照操作一步一步来即可。最后安装指示完全安装成功了。启动live服务器的时候出现错误。

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Error: Unable to call `next_data`, which is undefined or falsey

完整信息如下：

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11:11:56.718 DEBUG Generator: asset
11:11:56.760 INFO  Hexo is running at http://localhost:4000 . Press Ctrl+C to stop.
11:11:56.775 DEBUG Database saved
11:11:58.112 DEBUG Rendering HTML post: 2021/12/07/11google-adsense/index.html
Unhandled rejection Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk) [Line 36, Column 25]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk) [Line 49, Column 17]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/_partials/head/head-unique.njk) [Line 20, Column 15]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk) [Line 3, Column 3]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/_partials/header/index.njk) [Line 6, Column 15]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk) [Line 5, Column 3]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/_partials/header/sub-menu.njk) [Line 2, Column 29]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/_partials/header/sub-menu.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk) [Line 9, Column 12]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/_partials/comments.njk) [Line 51, Column 24]
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/_partials/languages.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/_third-party/math/index.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/post.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/_third-party/quicklink.njk)
  Template render error: (/home/zhou/Projects/blog/themes/next/layout/inject/bodyEnd/waline.njk) [Line 5, Column 15]
  Error: Unable to call `next_data`, which is undefined or falsey
    at Object._prettifyError (/home/zhou/Projects/blog/node_modules/nunjucks/src/lib.js:36:11)
    at /home/zhou/Projects/blog/node_modules/nunjucks/src/environment.js:561:19
    at Template.root [as rootRenderFunc] (eval at _compile (/home/zhou/Projects/blog/node_modules/nunjucks/src/environment.js:631:18), <anonymous>:45:3)
    at Template.render (/home/zhou/Projects/blog/node_modules/nunjucks/src/environment.js:550:10)
    at /home/zhou/Projects/blog/node_modules/hexo/lib/plugins/renderer/nunjucks.js:67:37
    at _View._compiled (/home/zhou/Projects/blog/node_modules/hexo/lib/theme/view.js:136:50)
    at _View.render (/home/zhou/Projects/blog/node_modules/hexo/lib/theme/view.js:39:17)
    at /home/zhou/Projects/blog/node_modules/hexo/lib/hexo/index.js:64:21
    at tryCatcher (/home/zhou/Projects/blog/node_modules/bluebird/js/release/util.js:16:23)
    at /home/zhou/Projects/blog/node_modules/bluebird/js/release/method.js:15:34
    at RouteStream._read (/home/zhou/Projects/blog/node_modules/hexo/lib/hexo/router.js:47:5)
    at RouteStream.Readable.read (internal/streams/readable.js:465:10)
    at resume_ (internal/streams/readable.js:963:12)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)

升级 NexT v8.2.1 -> v8.8.2

上面链接的博文中也提到同样的问题，后来通过升级解决。我就直接升级到最新的版本。关于怎么升级，官方有推荐的升级指南（Upgrade）。
官方的文档提示升级之前备份配置文件 _config.yml 以及自定义的其他文件。我的这些文件反也是单独保存在别的文件夹中，通过链接的方式链接到NexT的配置中。直接用git：

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git pull && git checkout v8.8.2

然后重新链接_config.yml。这个问题算是解决了。

继续运行live结果这次出现了另外一个问题：

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TypeError: Cannot read property 'color' of undefined

完整信息如下：

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10:16:48.303 FATAL {
  err: TypeError: Cannot read property 'color' of undefined
      at module.exports (/home/zhou/Projects/blog/themes/next/scripts/events/lib/vendors.js:34:41)
      at Hexo.<anonymous> (/home/zhou/Projects/blog/themes/next/scripts/events/index.js:9:27)
      at Hexo.tryCatcher (/home/zhou/Projects/blog/node_modules/bluebird/js/release/util.js:16:23)
      at Hexo.<anonymous> (/home/zhou/Projects/blog/node_modules/bluebird/js/release/method.js:15:34)
      at /home/zhou/Projects/blog/node_modules/hexo/lib/extend/filter.js:67:52
      at tryCatcher (/home/zhou/Projects/blog/node_modules/bluebird/js/release/util.js:16:23)
      at Object.gotValue (/home/zhou/Projects/blog/node_modules/bluebird/js/release/reduce.js:166:18)
      at Object.gotAccum (/home/zhou/Projects/blog/node_modules/bluebird/js/release/reduce.js:155:25)
      at Object.tryCatcher (/home/zhou/Projects/blog/node_modules/bluebird/js/release/util.js:16:23)
      at Promise._settlePromiseFromHandler (/home/zhou/Projects/blog/node_modules/bluebird/js/release/promise.js:547:31)
      at Promise._settlePromise (/home/zhou/Projects/blog/node_modules/bluebird/js/release/promise.js:604:18)
      at Promise._settlePromiseCtx (/home/zhou/Projects/blog/node_modules/bluebird/js/release/promise.js:641:10)
      at _drainQueueStep (/home/zhou/Projects/blog/node_modules/bluebird/js/release/async.js:97:12)
      at _drainQueue (/home/zhou/Projects/blog/node_modules/bluebird/js/release/async.js:86:9)
      at Async._drainQueues (/home/zhou/Projects/blog/node_modules/bluebird/js/release/async.js:102:5)
      at Immediate.Async.drainQueues [as _onImmediate] (/home/zhou/Projects/blog/node_modules/bluebird/js/release/async.js:15:14)
      at processImmediate (internal/timers.js:464:21)
} Something's wrong. Maybe you can find the solution here: %s https://hexo.io/docs/troubleshooting.html

设置进度条color属性

根据上面的错误提示，一个叫 color 属性为空导致。对比了默认的配置文件和我自己的默认文件之后，发现我的配置文件 _config.yml 中没有 pace 字段，当然也不会有下面的属性 color 了。
这个 pace 是用来显示页面加载的动画和进度的，我暂时是没有用到。直接把这块的配置复制过来，不启用就可以了。

完整这步之后就再也没有其他的问题了。

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pace:
  enable: false
  # All available colors:
  # black | blue | green | orange | pink | purple | red | silver | white | yellow
  color: blue
  # All available themes:
  # big-counter | bounce | barber-shop | center-atom | center-circle | center-radar | center-simple
  # corner-indicator | fill-left | flat-top | flash | loading-bar | mac-osx | material | minimal
  theme: minimal