这是因为该选项等待的是字符串而不是函数，在任何情况下，您可以使用服务器url server.url/file-uploads上传图像。

安装SunEditor后，如果您上传任何图像，则它将采用默认的base64数据格式，在生产中，我们需要使用我们的自定义API用于主机图像。
为此，我们有一个方法onImageUploadBefore下面我分享了我在我的React应用程序中工作的组件，你可以在next.js中尝试同样的事情
remember:在next.js中，您应该动态地使用import SunEditor，示例如下

import dynamic from "next/dynamic";
const Editor = dynamic(() => import("suneditor-react"), {
  ssr: false,
});

import axios from "axios";
import { useRef } from "react";
import Editor from "suneditor-react";

export default function TestSunEditorJsx() {
  const editor = useRef();

  const getSunEditorInstance = (sunEditor) => {
    editor.current = sunEditor;
  };

  function onImageUploadBefore() {
    return (files, _info, _core, uploadHandler) => {
      (async () => {
        const formData = new FormData();
        formData.append("file", files[0]);

        const { data } = await axios.post(
          "http://localhost:1000/api/v1/upload/single",
          formData
        );

        const res = {
          result: [
            {
              url: data?.url,
              name: "thumbnail",
            },
          ],
        };

        uploadHandler(res);
      })();

      // called here for stop double image
      uploadHandler();
    };
  }

  return (
    <Editor
      getSunEditorInstance={getSunEditorInstance}
      onImageUploadBefore={onImageUploadBefore()}
      setOptions={{
        buttonList: [["image"]],
      }}
      height="50vh"
    />
  );
}