如何创建showdown.js降价扩展 [英] How to create a showdown.js markdown extension
问题描述
使用以下代码，我得到工作输出：
Using the following code, I get working output:
<html>
<head>
<script type="text/javascript" src="/js/showdown.js"></script>
</head>
<body>
<script type="text/javascript">
var converter = new Showdown.converter();
alert(converter.makeHtml('*test* abc'));
</script>
</body>
</html>
返回< p>< em> test< / em> abc< / p>
我现在想添加一个扩展名。 github页面建议可以通过以下方式完成：
I would now like to add an extension. The github page suggests this can be done with:
<script src="src/extensions/twitter.js" />
var converter = new Showdown.converter({ extensions: 'twitter' });
但是，将我的代码修改为：
However, modifying my code to:
<html>
<head>
<script type="text/javascript" src="/js/showdown.js"></script>
<script type="text/javascript" src="/js/twitter.js"></script>
</head>
<body>
<script type="text/javascript">
var converter = new Showdown.converter({ extensions: 'twitter' });
alert(converter.makeHtml('*test* abc'));
</script>
</body>
</html>
产生错误
"Uncaught Extension 'undefined' could not be loaded. It was either not found or is not a valid extension."
添加以下代码（如过滤器示例）
var demo = function(converter) {
return [
// Replace escaped @ symbols
{ type: 'lang', function(text) {
return text.replace(/\\@/g, '@');
}}
];
}
产生错误未捕获的SyntaxError：意外的令牌（
我想创建一个像这样的扩展 https://github.com/rennat/python-markdown-oembed 解释！[视频]（youtube_link） ，但目前还不清楚如何开始添加这种支持。
I would like to create an extension like this one https://github.com/rennat/python-markdown-oembed to interpret a , but it's unclear how to begin adding this support.
推荐答案
在你的最后一个块中，你在'lang'之后有一个逗号，后面跟着立即使用函数。这是无效的json。
In your last block you have a comma after 'lang', followed immediately with a function. This is not valid json.
编辑
它似乎自述文件不正确。我不得不传递一个字符串'twitter'的数组。
It appears that the readme was incorrect. I had to to pass an array with the string 'twitter'.
var converter = new Showdown.converter({extensions: ['twitter']});
converter.makeHtml('whatever @meandave2020');
// output "<p>whatever <a href="http://twitter.com/meandave2020">@meandave2020</a></p>"
我提交了拉取请求以更新此内容。
I submitted a pull request to update this.
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