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江南卫视，《笑傲江湖》准时播放。正是因此井陉口除了是民间来往的便捷之道外，在战争年代更是兵家必争之地。"Huawei Cloud" preferred Hui in the cloud, with the whole stadium as low as 20% discount, 6.19-6.30 opening and P20 signing in.First of all, let's introduce the business: in the purchase process, you can select the color of the mobile phone and enter the purchase quantity. At the same time, there are two display areas in the page, which respectively display the color and quantity that the user has just selected. There is also a button that dynamically displays the next operation. We need to query the inventory corresponding to the mobile phone of this color. If the inventory quantity is less than the purchase quantity this time, the button will be disabled and the copy with insufficient inventory will be displayed. Otherwise, the button will be highlighted and can be clicked and displayed if the shopping cart is displayed.