如图：框起来按钮就是

安装

$ npm install --save tui-editor # 最新版本
$ npm install --save tui-editor@<version> # 指定版本

使用

参考：vue-element-admin
其实可以直接从 vue-element-admin里面复制过来

default-options.js 是默认配置
toolbarItems.image注释掉，因为我们要自定义（可以自己展示出来看下效果）

export default {
  minHeight: '200px',
  previewStyle: 'vertical',
  useCommandShortcut: true,
  useDefaultHTMLSanitizer: true,
  usageStatistics: false,
  hideModeSwitch: false,
  // placeholder: '请输入描述',
  toolbarItems: [
    'heading',
    'bold',
    'italic',
    'strike',
    'divider',
    'hr',
    'quote',
    'divider',
    'ul',
    'ol',
    'task',
    'indent',
    'outdent',
    'divider',
    'table',
    // 'image',
    'link',
    'divider',
    'code',
    'codeblock',
  ]
}

我们主要改的是index.vue这个文件
index.vue

<template>
  <div>
    <div :id="id"></div>
    <input style="display: none" ref="files" @change="uploadFile" type="file" accept="image/*">
  </div>
</template>
<script>
  // deps for editor
  import 'codemirror/lib/codemirror.css' // codemirror
  import 'tui-editor/dist/tui-editor.css' // editor ui
  import 'tui-editor/dist/tui-editor-contents.css' // editor content

  import Editor from 'tui-editor'
  import defaultOptions from './default-options'
  //定义的上传地址
  import {getQiniuToken} from "../../service/apiList"

  export default {
    name: 'MarddownEditor',
    props: {
      value: {
        type: String,
        default: ''
      },
      id: {
        type: String,
        required: false,
        default() {
          return 'markdown-editor-' + +new Date() + ((Math.random() * 1000).toFixed(0) + '')
        }
      },
      options: {
        type: Object,
        default() {
          return defaultOptions
        }
      },
      mode: {
        type: String,
        default: 'markdown'
      },
      height: {
        type: String,
        required: false,
        default: '300px'
      },
      language: {
        type: String,
        required: false,
        default: 'en_US' // https://github.com/nhnent/tui.editor/tree/master/src/js/langs
      }
    },
    data() {
      return {
        editor: null,
        token: ""
      }
    },
    computed: {
      editorOptions() {
        const options = Object.assign({}, defaultOptions, this.options)
        options.initialEditType = this.mode
        options.height = this.height
        options.language = this.language
        return options
      }
    },
    watch: {
      value(newValue, preValue) {
        if (newValue !== preValue && newValue !== this.editor.getValue()) {
          this.editor.setValue(newValue)
        }
      },
      language(val) {
        this.destroyEditor()
        this.initEditor()
      },
      height(newValue) {
        this.editor.height(newValue)
      },
      mode(newValue) {
        this.editor.changeMode(newValue)
      }
    },
    mounted() {
      this.initEditor()
    },
    destroyed() {
      this.destroyEditor()
    },
    methods: {
      initEditor() {
        this.editor = new Editor({
          el: document.getElementById(this.id),
          ...this.editorOptions
        })
        if (this.value) {
          this.editor.setValue(this.value)
        }
        this.editor.on('change', () => {
          this.$emit('input', this.editor.getValue())
        })
        //----------------新增↓
        /*
        * 添加自定义按钮
        * */
        //获取编辑器上的功能条
        let toolbar = this.editor.getUI().getToolbar();
        let fileDom = this.$refs.files;
        //添加事件
        this.editor.eventManager.addEventType('uploadEvent');
        this.editor.eventManager.listen('uploadEvent', () => {
          fileDom.click();
          this.getqiniuToken()
          // Do some other thing...
        });
        // 添加自定义按钮 第二个参数代表位置，不传默认放在最后
        toolbar.addButton({
          name: 'customize',
          className: 'upload-img',
          event: 'uploadEvent',
          tooltip: 'insert image',
          $el: $('<button class="custom-button fa fa-image" style="font-size: 14px;color: #000"></button>')
        }, 13);

      },
      //----------------新增↑
      destroyEditor() {
        if (!this.editor) return
        this.editor.off('change')
        this.editor.remove()
      },
      setValue(value) {
        this.editor.setValue(value)
      },
      getValue() {
        return this.editor.getValue()
      },
      setHtml(value) {
        this.editor.setHtml(value)
      },
      getHtml() {
        return this.editor.getHtml()
      },
      //----------------新增↓
      /*
      * 自定义上传图片处理
      * */
      uploadFile(e) {
        let target = e.target;
        let file = target.files[0];
        const formData = new FormData();
        formData.append("file", file);
        formData.append("token", this.qnToken);
        this.$axios({
          method: "post",
          url: "https://upload.qiniup.com",
          data: formData
        })
          .then(res => {
          //上传成功地址拼接
            let imgUrl = "https://qiniu.****.com/" + res.data.key;
            this.addImgToMd(imgUrl)

          })
          .catch(error => {
            console.error(error.response);
          });
        target.value = "";//这个地方清除一下不然会有问题
      },
      //添加图片到markdown
      addImgToMd(data) {
        let editor = this.editor.getCodeMirror();
        let editorHtml = this.editor.getCurrentModeEditor();
        let isMarkdownMode = this.editor.isMarkdownMode();
        if (isMarkdownMode) {
          editor.replaceSelection(`![img](${data})`);
        } else {
          let range = editorHtml.getRange();
          let img = document.createElement('img');
          img.src = `${data}`;
          img.alt = "img";
          range.insertNode(img);
        }
      },
      getqiniuToken() {
        this.$axios({
          method: "get",
          url: getQiniuToken
        })
          .then(res => {
            this.qnToken = res.data.upToken;
          })
          .catch(error => {
            console.error(error.response);
          });
      },
     //----------------新增↑
    }
  }
</script>

最后引入组件即可