npm install showdown --save

<template>
  <div v-html="htms"></div> 
</template>

<script>
import showdown from "showdown"
converter.setOption('tables', true);  // 将表格显示出来
export default {
  data() {
    return {
      htms: ""
    }
  },
  created() {
    this.setMakedown()
  },
  methods: {
    setMakedown() {
     this.htms = converter.makeHtml('# 这是一个标题')
    }
  }
}
</script>

npm install highlight --save

import hljs from "highlight.js"
import 'highlight.js/styles/default.css';

// 定义自定义指令 highlight 代码高亮
Vue.directive('highlight',function (el) {
 let blocks = el.querySelectorAll('pre code');
 blocks.forEach((block)=>{
  hljs.highlightBlock(block)
 })
})

<template>
  <div v-html="htms" v-highlight></div> 
</template>