add: 图片上传框位置参数可传

src/components/Editor/index.js

       showUpload,
       multiple,
       emojiPopoverPlacement,
+      uploadPopoverPlacement,
+      uploadOverlayClassName,
       closeUploadWhenBlur,
       maxUpload,
       // btnSubmitText,
                   trigger="click"
                   // TODO: 针对非 react.js，直接使用 click 事件来控制展开或关闭
                   // visible={this.state.showUpload}
+                  placement={uploadPopoverPlacement}
+                  overlayClassName={uploadOverlayClassName}
+                  autoAdjustOverflow={false}
                   overlayStyle={{ zIndex: 999 }}
                   onVisibleChange={
                     closeUploadWhenBlur
                       <div className="clearfix" />
                     </div>
                   }
-                  placement="bottomLeft"
                   title={
                     <div style={{ margin: "5px auto" }}>
                       <span>
   showEmoji: PropTypes.bool,
   emojiPopoverPlacement: PropTypes.string,
   showUpload: PropTypes.bool,
+  uploadPopoverPlacement: PropTypes.string,
+  uploadOverlayClassName: PropTypes.string,
   multiple: PropTypes.bool,
   closeUploadWhenBlur: PropTypes.bool,
   maxUpload: PropTypes.number,
   multiple: true,
   emojiPopoverPlacement: "bottomLeft",
   closeUploadWhenBlur: false,
+  uploadPopoverPlacement: "bottomLeft",
+  uploadOverlayClassName: "",
   maxUpload: 1,
   // btnSubmitText: "发表",
   btnLoading: false,

src/index.js

       console.log(c);
     },
     editorProps: {
-      // emojiPopoverPlacement: "bottom"
+      // emojiPopoverPlacement: "bottom",
+      uploadPopoverPlacement: "top"
     }
   });
 }