feat: 在綫聊天新增facebook洽談外掛程式 closed #918

feat: 添加artalk評論 closed #933
fix: 修復 開啟 archor 後， facebook評論加載不正確的 bug
fix: 修復 facebook 評論數無法加載的 bug

layout/includes/third-party/comments/facebook_comments.pug

@@ -1,16 +1,26 @@
-#fb-root
+- const fbSDKVer = 'v14.0'
+- const fbSDK = theme.messenger.enable ? `https://connect.facebook.net/${theme.facebook_comments.lang}/sdk/xfbml.customerchat.js#xfbml=1&version=${fbSDKVer}` : `https://connect.facebook.net/${theme.facebook_comments.lang}/sdk.js#xfbml=1&version=${fbSDKVer}`
+
 script.
   function loadFBComment () {
-    var themeNow = document.documentElement.getAttribute('data-theme') === 'dark' ? 'dark' : 'light'
-    document.getElementsByClassName('fb-comments')[0].setAttribute('data-colorscheme',themeNow)
+    document.getElementById('fb-root') ? '' : document.body.insertAdjacentHTML('afterend', '<div id="fb-root"></div>')
 
-    if (typeof FB === 'object') FB.XFBML.parse()
+    const themeNow = document.documentElement.getAttribute('data-theme') === 'dark' ? 'dark' : 'light'
+    const $fbComment = document.getElementsByClassName('fb-comments')[0]
+    $fbComment.setAttribute('data-colorscheme',themeNow)
+    $fbComment.setAttribute('data-href', '!{urlNoIndex(page.permalink)}')
+
+    if (typeof FB === 'object') {
+      FB.XFBML.parse(document.getElementsByClassName('post-meta-commentcount')[0])
+      FB.XFBML.parse(document.getElementById('post-comment'))
+    }
     else {
       let ele = document.createElement('script')
-      ele.setAttribute('src','https://connect.facebook.net/!{theme.facebook_comments.lang}/sdk.js#xfbml=1&version=v13.0&appId=!{theme.facebook_comments.app_id}&autoLogAppEvents=1')
+      ele.setAttribute('src','!{fbSDK}')
       ele.setAttribute('async', 'true')
       ele.setAttribute('defer', 'true')
       ele.setAttribute('crossorigin', 'anonymous')
+      ele.setAttribute('id', 'facebook-jssdk')
       document.getElementById('fb-root').insertAdjacentElement('afterbegin',ele)
     }   
   }