zencart stock_by_attribute_1.5.3按属性购买，球衣电商网站常用的。This add-on is based on a Zen Cart contribution by dafonz (products_with_attributes_stock), which was adapted by danielcor for Zen Cart 1.3 and further adapted by kuroi for 1.3.5+. Above Media updated the code for 1.5.0+. POTTERYHOUSE updated the code