Vue3中实现代码高亮的两种方法(prismjs和highlight.js)

//安装prismjs 插件
npm install prismjs -S
 
// vite
npm install vite-plugin-prismjs -D

import { prismjsPlugin } from 'vite-plugin-prismjs';
export default defineConfig({
	plugins: [
    	vue(),
    	prismjsPlugin({
      		languages: 'all', // 语言
      		plugins: ['line-numbers', 'copy-to-clipboard'], //官网有其他功能,这里开启行数和复制按钮功能
      		theme: 'okaidia', // 主题
      		css: true,
    	}),
  ],
})

<template>
  <pre><code class="language-js line-numbers">{{ codes }}</code></pre>
</template>
 
<script lang="ts">
import { defineComponent } from 'vue';
import Prism from 'prismjs';
export default defineComponent({
  name: 'HtmlRender',
  setup() {
    onMounted(() => {
      Prism.highlightAll(); // 切换更新内容则重新调用这个方法
    });
  }
});
</script>

pre {
    overflow: hidden !important;
    code{ 
        display: inline-block;
        padding-bottom: 20px;
        position: relative;
        top: 20px;
    }
    &::before {
        content: "";
        position: absolute;
        background: red;
        width: 10px;
        height: 10px;
        border-radius: 50%;
        top: 10px;
        left: 15px;
        transform: translate(-50%);
    }
    &::after {
        content: "";
        position: absolute;
        background: sandybrown;
        width: 10px;
        height: 10px;
        border-radius: 50%;
        top: 10px;
        left: 30px;
        transform: translate(-50%);
    }
    code:first-child{
        &::after{
            content: "";
            position: absolute;
            background: limegreen;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            top: -24px;
            left: -7px;
            transform: translate(-50%);
        }
    }
}

npm install highlight.js --save 或 yarn add highlight.js

// highlight 的样式，依赖包，组件
import hljs from "highlight.js";
import "highlight.js/styles/github.css";
 
const app = createApp(App);
app.use((app) => {
    app.directive("highlight", {
      mounted(el) {
        const blocks = el.querySelectorAll("pre code"); // querySelectorAll可以根据自己的富文本生成的代码做调整 我这里默认刚好
        blocks.forEach((block: any) => {
          // 在forEach中做一些操作
          // 1.创建ul节点
          const ul = document.createElement("ul");
          // 2.根据换行符获取行数，根据获取的行数生成行号
          const rowCount = block.outerHTML.split("\n").length;
          for (let i = 1; i <= rowCount; i++) {
            //创建li节点，创建文本节点
            const li = document.createElement("li");
            const text = document.createTextNode(String(i));
            //为li追加文本节点，将li加入ul
            li.appendChild(text);
            ul.appendChild(li);
          }
          // 3.给行号添加类名
          ul.className = "pre-numbering";
          // 4.将ul节点加到 代码块
          block.parentNode.appendChild(ul);
          hljs.highlightBlock(block);
        });
      },
    });
  })
  .mount("#app");

pre {
  position: relative;
  background-color: #fafafa;
  font-size: 14px;
  padding: 8px 8px 0px 8px;
  overflow: hidden;
  border: 1px solid #ccc;
}
 
code.hljs {
  background-color: #fafafa !important;
  line-height: 22px;
  padding: 0 0 0.5em 2.2em !important;
  white-space: unset;
}
 
.pre-numbering {
  position: absolute;
  top: 8px;
  left: 0;
  width: 30px;
  border-right: 1px solid #c5c5c5;
  background-color: #fafafa;
  text-align: center;
  line-height: 22px;
}
 
.pre-numbering li {
  list-style: none;
  color: #383a42;
  font-size: 14px;
}

<highlightjs language='javascript' code="var x = 5;" />