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老丁闻言率先起身，何员外，杨公子急着启程，咱们也别打扰了，后面在叙吧。10,000 Yuan Li Dong "Five Warnings of" Depth "Dandong Real Estate Speculation" and "Go, Go to Dandong Real Estate Speculation! Li Shen, Editor of "Close-up" Bridgehead Dandong: Waiting for Outbreak ""Recommended"? Sharing an Internal Growth Case* O 'k1} & s8 A7 k6}, g8 N & ~ Jiang Dongyuan has made great efforts for this film.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.