* [task#149892,done,1h] finish task.

module/design/control.php

@@ -222,12 +222,13 @@ class design extends control
      * View a design.
      *
      * @param  int    $designID
+     * @param  int    $version
      * @access public
      * @return void
      */
-    public function view(int $designID = 0)
+    public function view(int $designID = 0, int $version = 0)
     {
-        $design = $this->design->getByID($designID);
+        $design = $this->design->getByID($designID, $version);
         $this->commonAction($design->project, $design->product, $designID, $design->type);
 
         $this->session->set('revisionList', $this->app->getURI(true));
@@ -244,6 +245,7 @@ class design extends control
         $this->view->actions  = $this->loadModel('action')->getList('design', $design->id);
         $this->view->repos    = $this->loadModel('repo')->getRepoPairs('project', $design->project);
         $this->view->project  = $project;
+        $this->view->version  = $version == 0 ? $design->version : $version;
         $this->view->typeList = $project->model == 'waterfall' ? $this->lang->design->typeList : $this->lang->design->plusTypeList;
 
         $this->display();

module/design/model.php

@@ -254,15 +254,22 @@ class designModel extends model
      * @access public
      * @return object|bool
      */
-    public function getByID(int $designID = 0): object|bool
+    public function getByID(int $designID = 0, int $version = 0): object|bool
     {
         if(common::isTutorialMode()) return $this->loadModel('tutorial')->getDesign();
 
         $design = $this->dao->select('*')->from(TABLE_DESIGN)->where('id')->eq($designID)->fetch();
         if(!$design) return false;
 
+        if($version == 0) $version = $design->version;
+
         $this->app->loadLang('product');
-        $design->files       = $this->loadModel('file')->getByObject('design', $designID);
+        $this->loadModel('file');
+        $spec = $this->dao->select('name,`desc`,files')->from(TABLE_DESIGNSPEC)->where('design')->eq($designID)->andWhere('version')->eq($version)->fetch();
+        $design->name  = !empty($spec->name)   ? $spec->name  : '';
+        $design->desc  = !empty($spec->desc)   ? $spec->desc  : '';
+        $design->files = !empty($spec->files)  ? $this->file->getByIdList($spec->files) : array();
+
         $design->productName = $design->product ? $this->dao->findByID($design->product)->from(TABLE_PRODUCT)->fetch('name') : $this->lang->product->all;
         $design->project     = (int)$design->project;
         $design->product     = (int)$design->product;

module/design/ui/view.html.php

@@ -11,10 +11,30 @@ declare(strict_types=1);
 namespace zin;
 
 jsVar('type', strtolower($design->type));
+
+/* 版本列表。Version list. */
+$versions = array();
+for($i = $design->version; $i >= 1; $i--)
+{
+    $versionItem = setting()
+        ->text("#{$i}")
+        ->url(inlink('view', "designID={$design->id}&version=$i"));
+
+    $versionItem->selected($version == $i);
+    $versions[] = $versionItem;
+}
+
+$versionBtn = count($versions) > 1 ? to::title(dropdown
+(
+    btn(set::type('ghost'), setClass('text-link font-normal text-base'), "#{$version}"),
+    set::items($versions)
+)) : null;
+
 detailHeader
 (
     set::backUrl(createLink('design', 'browse', "projectID={$design->project}")),
     to::title(entityLabel(set(array('entityID' => $design->id, 'level' => 1, 'text' => $design->name))), $design->deleted ? span(setClass('label danger'), $lang->deleted) : null),
+    $versionBtn
 );
 
 $canModify = common::canModify('project', $project);
@@ -75,6 +95,7 @@ if($this->design->isClickable($design, 'confirmStoryChange'))
 
 detailBody
 (
+    $versionBtn,
     sectionList
     (
         section