Get showdown.js, this is the js needed to change the style
This is their github, https://github.com/showdownjs/showdown
but let's use the imported bootcdn showdown.min.js.
http://www.bootcdn.cn/showdown/
Make website settings
Introduced in html
<script src="https://cdn.bootcss.com/showdown/1.8.6/showdown.js"></script>
Our article is in a div with an id of postcont
<!--文章内容开始-->
<div id="postcont" style="white-space: pre">文章内容</div>
<script>
var converter = new showdown.Converter();
var post = document.getElementById('postcont');
var text = post.textContent||post.innerText;//获取文本内容， post.textContent是非ie所用，post.innerText是ie所用，
var html = converter.makeHtml(text); //这里写成这样是为了兼容
post.innerHTML=html;
</script>
<!--文章内容结束-->Effect:
