JS部分：

//引入Qill插件
import Quill from "quill";

// 自定义字体
let fontFamily = ['SimSun', 'SimHei', 'Microsoft-YaHei', 'KaiTi', 'FangSong', 'Arial', 'pingfang'];
Quill.imports['formats/font'].whitelist = fontFamily;
Quill.register(Quill.imports['formats/font'])

// 自定义文字大小
let fontSize = ['10px', '12px', '14px', '16px', '20px', '24px', '36px']
Quill.imports['attributors/style/size'].whitelist = fontSize;
Quill.register(Quill.imports['attributors/style/size']);

const toolbarOptions = [
  [
    "bold",
    "italic",
    "underline",
    "strike",
    "blockquote",
    "code-block",
    { header: 1 },
    { header: 2 },
    { list: "ordered" },
    { list: "bullet" },
    { indent: "-1" },
    { indent: "+1" },
    { script: "sub" }, // 下标
    { script: "super" }, // 上标
    { align: [] },
    { color: [] },
    { background: [] },
    "link",
    "image",
  ],
  [{ size: fontSize }], // 文字大小
  [{ header: [1, 2, 3, 4, 5, 6, false] }], // 标题
  [{ font: fontFamily }], // 字体
];

 

css部分：

::v-deep{
  /*
    文字大小
  */
  .ql-snow .ql-picker.ql-size .ql-picker-label[data-value='10px']::before,
  .ql-snow .ql-picker.ql-size .ql-picker-item[data-value='10px']::before {
    content: '10px';
  }
  .ql-snow .ql-picker.ql-size .ql-picker-label[data-value='12px']::before,
  .ql-snow .ql-picker.ql-size .ql-picker-item[data-value='12px']::before {
    content: '12px';
  }
  .ql-snow .ql-picker.ql-size .ql-picker-label[data-value='14px']::before,
  .ql-snow .ql-picker.ql-size .ql-picker-item[data-value='14px']::before {
    content: '14px';
  }
  .ql-snow .ql-picker.ql-size .ql-picker-label[data-value='16px']::before,
  .ql-snow .ql-picker.ql-size .ql-picker-item[data-value='16px']::before {
    content: '16px';
  }
  .ql-snow .ql-picker.ql-size .ql-picker-label[data-value='20px']::before,
  .ql-snow .ql-picker.ql-size .ql-picker-item[data-value='20px']::before {
    content: '20px';
  }
  .ql-snow .ql-picker.ql-size .ql-picker-label[data-value='24px']::before,
  .ql-snow .ql-picker.ql-size .ql-picker-item[data-value='24px']::before {
    content: '24px';
  }
  .ql-snow .ql-picker.ql-size .ql-picker-label[data-value='36px']::before,
  .ql-snow .ql-picker.ql-size .ql-picker-item[data-value='36px']::before {
    content: '36px';
  }


  /*
    字体
  */
  .ql-snow .ql-picker.ql-font .ql-picker-label[data-value='SimSun']::before,
  .ql-snow .ql-picker.ql-font .ql-picker-item[data-value='SimSun']::before {
    content: '宋体';
    font-family: 'SimSun' !important;
  }
  .ql-snow .ql-picker.ql-font .ql-picker-label[data-value='SimHei']::before,
  .ql-snow .ql-picker.ql-font .ql-picker-item[data-value='SimHei']::before {
    content: '黑体';
    font-family: 'SimHei';
  }
  .ql-snow .ql-picker.ql-font .ql-picker-label[data-value='Microsoft-YaHei']::before,
  .ql-snow .ql-picker.ql-font .ql-picker-item[data-value='Microsoft-YaHei']::before {
    content: '微软雅黑';
    font-family: '微软雅黑';
  }
  .ql-snow .ql-picker.ql-font .ql-picker-label[data-value='KaiTi']::before,
  .ql-snow .ql-picker.ql-font .ql-picker-item[data-value='KaiTi']::before {
    content: '楷体';
    font-family: 'KaiTi' !important;
  }
  .ql-snow .ql-picker.ql-font .ql-picker-label[data-value='FangSong']::before,
  .ql-snow .ql-picker.ql-font .ql-picker-item[data-value='FangSong']::before {
    content: '仿宋';
    font-family: 'FangSong';
  }
  .ql-snow .ql-picker.ql-font .ql-picker-label[data-value='Arial']::before,
  .ql-snow .ql-picker.ql-font .ql-picker-item[data-value='Arial']::before {
    content: 'Arial';
    font-family: 'Arial';
  }
  .ql-snow .ql-picker.ql-font .ql-picker-label[data-value='pingfang']::before,
  .ql-snow .ql-picker.ql-font .ql-picker-item[data-value='pingfang']::before {
    content: '苹方';
    font-family: '苹方';
  }
  // 设置每个字体的css字体样式
  .ql-font-SimSun {
    font-family: 'SimSun';
  }
  .ql-font-SimHei {
    font-family: 'SimHei';
  }
  .ql-font-Microsoft-YaHei {
    font-family: '微软雅黑';
  }
  .ql-font-KaiTi {
    font-family: 'KaiTi';
  }
  .ql-font-FangSong {
    font-family: 'FangSong';
  }
  .ql-font-Arial {
    font-family: 'Arial';
  }
  .ql-font-pingfang {
    font-family: '苹方';
  }

  /*
    标题  
  */
  .ql-snow .ql-picker.ql-header .ql-picker-label::before,
  .ql-snow .ql-picker.ql-header .ql-picker-item::before {
    content: "文本" !important;
  }
  .ql-snow .ql-picker.ql-header .ql-picker-label[data-value="1"]::before,
  .ql-snow .ql-picker.ql-header .ql-picker-item[data-value="1"]::before {
    content: "标题1" !important;
  }
  .ql-snow .ql-picker.ql-header .ql-picker-label[data-value="2"]::before,
  .ql-snow .ql-picker.ql-header .ql-picker-item[data-value="2"]::before {
    content: "标题2" !important;
  }
  .ql-snow .ql-picker.ql-header .ql-picker-label[data-value="3"]::before,
  .ql-snow .ql-picker.ql-header .ql-picker-item[data-value="3"]::before {
    content: "标题3" !important;
  }
  .ql-snow .ql-picker.ql-header .ql-picker-label[data-value="4"]::before,
  .ql-snow .ql-picker.ql-header .ql-picker-item[data-value="4"]::before {
    content: "标题4" !important;
  }
  .ql-snow .ql-picker.ql-header .ql-picker-label[data-value="5"]::before,
  .ql-snow .ql-picker.ql-header .ql-picker-item[data-value="5"]::before {
    content: "标题5" !important;
  }
  .ql-snow .ql-picker.ql-header .ql-picker-label[data-value="6"]::before,
  .ql-snow .ql-picker.ql-header .ql-picker-item[data-value="6"]::before {
    content: "标题6" !important;
  }
}