fix: 修复CRUD固定表头不生效问题 (#8332)

* fix: 修复固定表头不生效

* 修复低版本浏览器固定表头不生效问题

---------

Co-authored-by: huangxj29 <huangxuejuan@xgd.com>

packages/amis-core/src/store/table.ts

@@ -1146,12 +1146,12 @@ export const TableStore = iRendererStore
         return;
       }
       const cols = [].slice.call(
-        table.querySelectorAll(':scope>colgroup>col[data-index]')!
+        table.querySelectorAll(':scope>thead>tr>th[data-index]')
       );
       cols.forEach((col: HTMLElement) => {
         const index = parseInt(col.getAttribute('data-index')!, 10);
         const column = self.columns[index];
-        column.setRealWidth(col.clientWidth);
+        column.setRealWidth(col.offsetWidth);
       });
     }
 

packages/amis-ui/scss/components/_table.scss

@@ -46,6 +46,10 @@
         position: absolute;
       }
     }
+
+    .#{$ns}Table-table {
+      table-layout: fixed;
+    }
   }
 
   &-heading {