利用Vue实现一个markdown编辑器实例代码

npm install marked --save
npm install highlight.js --save

<template>
 <div class="md_root_content" v-bind:style="{width:this.width,height: this.height}">

 <!--功能按钮区-->
 <div class="button_bar">
 <span v-on:click="addBold"><B>B</B></span>
 <span v-on:click="addUnderline"><B>U</B></span>
 <span v-on:click="addItalic"><B>I</B></span>
 </div>

 <!--主要内容区-->
 <div class="content_bar">

 <!--markdown编辑器区-->
 <div class="markdown_body">
 <textarea ref="ref_md_edit" class="md_textarea_content" v-model="markString">
 </textarea>
 </div>

 <!--解析成html区-->
 <div class="html_body">
 <p v-html="htmlString"></p>
 </div>

 </div>

 </div>
</template>

<style scoped>

 .md_root_content {
 display: flex;
 display: -webkit-flex;
 flex-direction: column;
 }

 .button_bar {
 width: 100%;
 height: 40px;
 background-color: #d4d4d4;
 display: flex;
 display: -webkit-flex;
 align-items: center;
 }

 div.button_bar span {
 width: 30px;
 line-height: 40px;
 text-align: center;
 color: orange;
 cursor: pointer;
 }

 .content_bar {
 display: flex;
 display: -webkit-flex;
 width: 100%;
 height: 100%;
 }

 .markdown_body {
 width: 50%;
 height: 100%;
 display: flex;
 display: -webkit-flex;
 }

 .html_body {
 width: 50%;
 height: 100%;
 display: flex;
 display: -webkit-flex;
 background-color: #dfe9f1;
 }

 .md_textarea_content {
 flex: 1;
 height: 100%;
 padding: 12px;
 overflow: auto;
 box-sizing: border-box;
 resize: none;
 outline: none;
 border: none;
 background-color: #f4f4f4;
 font-size: 14px;
 color: #232323;
 line-height: 24px;
 }
</style>

<script>
 import marked from 'marked' //解析mardown语法的库
 import hljs from 'highlight.js' //对代码进行语法高亮的库


 import testData from '../testData' //测试数据


 export default {
 name: "HelloMarkDown",

 props: {
 width: {
 type: String,
 default: '1000px'
 },

 height: {
 type: String,
 default: '600px'
 }
 },

 data() {
 return {
 markString: '',
 htmlString: '',
 }
 },

 mounted(){
 this.markString = testData
 },

 methods: {
 //加粗
 addBold() {
 this.changeSelectedText("**","**")
 },

 //斜体
 addItalic() {
 this.changeSelectedText("***","***")
 },

 addUnderline() {
 this.changeSelectedText("<u>","</u>")
 },

 changeSelectedText(startString,endString){
 let t = this.$refs.ref_md_edit
 if (window.getSelection) {
  if (t.selectionStart != undefined && t.selectionEnd != undefined) {

  let str1 = t.value.substring(0, t.selectionStart)
  let str2 = t.value.substring(t.selectionStart, t.selectionEnd)
  let str3 = t.value.substring(t.selectionEnd)

  let result = str1 + startString + str2 + endString + str3
  t.value = result
  this.markString = t.value
  }
 }
 }
 },

 watch: {

 //监听markString变化
 markString: function (value) {
 marked.setOptions({
  renderer: new marked.Renderer(),
  gfm: true,
  tables: true,
  breaks: true,
  pedantic: false,
  sanitize: false,
  smartLists: true,
  smartypants: false
 })

 this.htmlString = marked(value)
 },

 //监听htmlString并对其高亮
 htmlString: function (value) {
 this.$nextTick(() => {
  const codes = document.querySelectorAll(".html_body pre code");

  // elem 是一个 object
  codes.forEach(elem => {
  elem.innerHTML = "<ul><li>" + elem.innerHTML.replace(/\n/g, "\n</li><li>") + "\n</li></ul>"
  hljs.highlightBlock(elem);
  });
 });
 }
 }

 }
</script>

 props: {
 width: {
 type: String,
 default: '1000px'
 },

 height: {
 type: String,
 default: '600px'
 }
 },

 data() {
 return {
 markString: '',
 htmlString: '',
 }
 },

 mounted(){
  this.markString = testData
 },

 //加粗
  addBold() {
  this.changeSelectedText("**","**")
  },

  //斜体
  addItalic() {
  this.changeSelectedText("***","***")
  },

  //加下划线
  addUnderline() {
  this.changeSelectedText("<u>","</u>")
  },

 //监听markString变化
  markString: function (value) {
  marked.setOptions({
   renderer: new marked.Renderer(),
   gfm: true,
   tables: true,
   breaks: true,
   pedantic: false,
   sanitize: false,
   smartLists: true,
   smartypants: false
  })

  this.htmlString = marked(value)
  },

 //监听htmlString并对其高亮
  htmlString: function (value) {
  this.$nextTick(() => {
   const codes = document.querySelectorAll(".html_body pre code");

   // elem 是一个 object
   codes.forEach(elem => {
   elem.innerHTML = "<ul><li>" + elem.innerHTML.replace(/\n/g, "\n</li><li>") + "\n</li></ul>"
   hljs.highlightBlock(elem);
   });
  });
  }