remove "Choose an Option...“ in config product detail page attribute option
<script>spConfig.setInitialState = function(dropdown_id) { //select dropdown var dropdown = $(dropdown_id); //remove empty option from dropdown so it is not selectable after initial selection dropdown[0].remove(); //change selections in dropdowns for(index = 0; index < dropdown.length; index++) { if(dropdown[index].value != "") { dropdown.selectedIndex = index; var element = dropdown; var event = 'change'; //fire events if(document.createEventObject) { var evt = document.createEventObject(); return element.fireEvent('on'+event,evt) } else { var evt = document.createEvent("HTMLEvents"); evt.initEvent(event, true, true ); return !element.dispatchEvent(evt); } } } }; <?php foreach($_attributes as $_attribute): ?> spConfig.setInitialState("attribute<?php echo $_attribute->getAttributeId() ?>") <?php endforeach; ?></script>

?请在：app/design/frontend/default/sanorita/template/catalog/product/view/type/options/configurable.phtml

文件后面追加这段JS.