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老李已经决定了，明天就去买《白发魔女传》的实体书，支持天启。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.! ^-o3 O. b1 Z $s U/^Any ship (or any class of ships) with keels laid or at the corresponding stage of construction before the entry into force of these Rules may, provided that it meets the requirements of the 1960 International Regulations for Preventing Collisions at Sea:Analysis: Is Math.power (2, 53) the maximum value that can be expressed in JS, the maximum value plus 1 or the maximum value. What happened was this:, so it can never be greater than Math.power (2, 53).(6). Safria browser supports this event.II. Handling Address