diff --git a/wwwroot/index_tab.js b/wwwroot/index_tab.js
index a9f601c..57ba462 100644
--- a/wwwroot/index_tab.js
+++ b/wwwroot/index_tab.js
@@ -5,24 +5,35 @@
     if (bricks.TabPanel.prototype._dyn_patched) return;
     bricks.TabPanel.prototype._dyn_patched = true;
 
-    // 动态打开 tab：已存在则切换，不存在则新增
+    // 动态打开 tab：已存在（opts.items 同名）则切换，不存在则新增
     bricks.TabPanel.prototype.open_tab = async function(desc){
-        if (this.content_buffer.hasOwnProperty(desc.name)){
+        // 1. 已存在判断：opts.items 里找同名（不用 content_buffer，因 content 可能构建失败）
+        var existing = null;
+        for (var i=0;i<this.opts.items.length;i++){
+            if (this.opts.items[i].name === desc.name){ existing = this.opts.items[i]; break; }
+        }
+        if (existing){
             if (desc.name !== this.cur_tab_name){
                 this.cur_tab_name = desc.name;
-                this.switch_content(this.content_buffer[desc.name]);
+                var w = this.content_buffer[desc.name];
+                if (!w){
+                    var c = existing.content || {"widgettype":"urlwidget","options":{"url":existing.url}};
+                    w = await bricks.widgetBuild(c, this, {});
+                    if (w) this.content_buffer[desc.name] = w;
+                }
+                if (w) this.switch_content(w);
                 if (this.toolbar && this.toolbar.click) this.toolbar.click(desc.name);
             }
             return;
         }
+        // 2. 新增
         desc.content = desc.content || {"widgettype":"urlwidget","options":{"url":desc.url}};
         this.opts.items.push(desc);
         if (this.add_tab) this.add_tab(desc);
         var w = await bricks.widgetBuild(desc.content, this, {});
-        if (!w) return;
-        this.content_buffer[desc.name] = w;
+        this.content_buffer[desc.name] = w;  // 即使 null 也记录（标记已存在，避免重复新增）
         this.cur_tab_name = desc.name;
-        this.switch_content(w);
+        if (w) this.switch_content(w);
     };
 
     // 修复 show_tabcontent 的 bug（cur_tab_name 赋值用了未定义变量 name）