refactor:重构错误页，优化编辑器，上传新效果图

controllers/BaseController.go

@@ -161,7 +161,6 @@ func (c *BaseController) ShowErrorPage(errCode int, errMsg string) {
 	if errCode >= 200 && errCode <= 510 {
 		c.CustomAbort(errCode, buf.String())
 	}else{
-		c.CustomAbort(200, buf.String())
+		c.CustomAbort(500, buf.String())
 	}
-
 }

controllers/DocumentController.go

@@ -120,7 +120,7 @@ func (c *DocumentController) Read() {
 		doc, err = doc.FromCacheById(docId)
 		if err != nil {
 			beego.Error("从缓存中读取文档时失败 ->", err)
-			c.ShowErrorPage(500, "文档不存在或已删除")
+			c.ShowErrorPage(404, "文档不存在或已删除")
 		}
 	} else {
 		doc, err = doc.FromCacheByIdentify(id, bookResult.BookId)