image upload兼容性修改：添加limitOne适配私信

src/components/Editor/index.js

    *  -- evo 20200223
    */
   invokeFileListChange(fileList) {
-    this.props.handleChangeFileList(fileList);
+    const { limitOne, handleChangeFileList } = this.props;
+    handleChangeFileList(fileList);
     this.setState({ fileList });
-    if (isMobile) {
+    if (limitOne && isMobile) {
       const file = fileList[0];
       if (
         file &&
   onError: PropTypes.func,
   maxLength: PropTypes.number,
   // Enter事件相关
-  allowEnterSubmit: PropTypes.bool
+  allowEnterSubmit: PropTypes.bool,
+  // 私信仅允许选中一个，此处可以优化为通用的limit
+  limitOne: PropTypes.bool
 };
 
 Editor.defaultProps = {
   app: {},
   handleChangeFileList: () => {},
   // Enter事件相关
-  allowEnterSubmit: false
+  allowEnterSubmit: false,
+  limitOne: false
 };
 
 export default Comment(Editor);

src/index.js

             });
           }}
           allowEnterSubmit
+          limitOne
         />
       </App>
     );