商品详情默认选择第一个属性

app/code/Magento/Catalog/view/frontend/templates/product/view/options/wrapper.phtml

@@ -17,3 +17,18 @@ if ($block->hasRequiredOptions()) {
         <?= $block->getChildHtml('', true) ?>
     </div>
 </div>
+<script>
+    require(['jquery'], function ($) {
+        window.onload = function(){
+            if($('.swatch-attribute .swatch-option'))
+            {
+                var swatchObj = $('.swatch-attribute');
+
+                for(var i=0;i<swatchObj.length;i++)
+                {
+                    $(swatchObj[i]).find('.swatch-option:first').trigger('click');
+                }
+            }
+        }
+    });
+</script>
\ No newline at end of file