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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.Hulu一口气续订两部新剧《#高玩救未来# Future Man》及《#离家童盟# Marvels Runaways》第二季，新季皆预订13集。Result or commentSchedule), indicating when and how often the event starts, and the second part is the event action