第M件折扣，10个梯度（展示为批量加购按钮）

https://juan.sltestteam.shop/products/%E7%AC%ACm%E4%BB%B6%E6%8A%98%E6%89%A3-10%E4%B8%AA%E6%A2%AF%E5%BA%A6-%E5%B1%95%E7%A4%BA%E4%B8%BA%E6%89%B9%E9%87%8F%E5%8A%A0%E8%B4%AD%E6%8C%89%E9%92%AE-