Messenger Preview

Messenger Preview插件简介

Messenger Preview插件描述

Messenger has many different fmatting options, such as bold, italics, strikethrough, monospace code,  math fmatting through KaTeX. It can be hard to know what a message will look like without sending it once, so this extension shows a preview of how each message will appear befe you send it.

Note: the fmatting only renders properly on web Messenger. Mobile Messenger does not show any of the fmatting.

All previews are perfmed clientside. None of your infmation is sent to any thirdparty server.

See https://www.facebook.com/help/147348452522644 f details on fmatting text.

Suppted functions in the LaTeX math fmatting are at https://www.facebook.com/help/147348452522644.

▶ Usage

Write messages as nmal. As you type, you should see a light message appear
about where it will appear when you send the message (when it actually sends,
your message might attach to the group above it). Sometimes, the preview
is a bit hidden, requiring you to scroll down within the chat.

As usual in Messenger chats, write

 *bold*
 _italics_ f _italics_
 ~strikethrough~ f ~~strikethrough~~
 \($\backslash )\; to\; display\; inline\; math\; using\; LaTeX,\; e.g.\; `\backslash (\backslash frac\{1\}\{2\}\backslash )`\; \backslash [$ \backslash ]\; to\; display\; math\; that\; takes\; up\; the\; whole\; message.\; This\; may\; include\; scrollbars\; is\; useful\; f\; long\; chunks\; of\; math.\; `inline\; code`\; ```full\; message\; code```\; f\; code\; with\; syntax\; highlighting,\; use\; ```python\; def\; f(a,b):\; return\; a\; +\; b\; ```\; If\; necessary,\; press\; ctrl+enter\; to\; create\; a\; newline\; within\; a\; message.\; The\; math\; uses\; a\; subset\; of\; KaTeX,\; which\; is\; itself\; a\; subset\; of\; LaTeX.\; See\; the\; [Katex\; Docs](https://katex.g/docs/suppted.html)\; f\; suppted\; functions.\; Some\; functions\; only\; wk\; within\; math\; that\; takes\; up\; the\; whole\; message\; (`\backslash [...\backslash ]`).\; If\; anything\; at\; all\; is\; wrong,\; none\; of\; the\; message\; will\; render\; as\; math.\; Clicking\; the\; three\; dots\; to\; the\; left\; of\; a\; message\; then\; "Show\; Original"\; will\; remove\; all\; fmatting\; from\; the\; message.\; ▶\; Limitations\; This\; is\; an\; unofficial\; extension;\; Facebook\; might\; change\; Messenger\; at\; any\; time\; which\; could\; break\; this\; extension.\; The\; extension\; only\; wks\; in\; www.messenger.com\; www.facebook.com/messenger,\; not\; the\; preview\; within\; www.facebook.com.$$

Messenger Preview插件离线安装方法

1.首先用户点击谷歌浏览器右上角的自定义及控制按钮，在下拉框中选择设置。

2.在打开的谷歌浏览器的扩展管理器最左侧选择扩展程序或直接输入：chrome://extensions/

3.找到自己已经下载好的Chrome离线安装文件xxx.crx，然后将其从资源管理器中拖动到Chrome的扩展管理界面中，这时候用户会发现在扩展管理器的中央部分中会多出一个”拖动以安装“的插件按钮。

4.下载 Messenger PreviewChrome插件v0.1版本到本地。

5.勾选开发者模式，点击加载已解压的扩展程序，将文件夹选择即可安装插件。

注意：最新版本的chrome浏览器直接拖放安装时会出现“程序包无效CRX-HEADER-INVALID”的报错信息，参照这篇文章即可解决