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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.I. Collision Inspection of BIM Technology in Metro Station Comprehensive Pipelines17岁的女高中生花园佳代面前，突然出现了从未来穿越来的30多岁的自己，并警告她再这样下去一辈子都嫁不出去，30多岁还是处女，而且一直暗恋的青梅竹马的妻子也不是自己。大受打击的佳代为了改变未来决定做出行动，这时对佳代饶有兴趣的谜之帅哥泷登场了..一个普通中学生、爱吐槽，在经历了一次打劫后，人生开始了翻天覆地的变化崭新动态漫画，阅读新体验！每周双更，周二、周四敬请期待The First World War was a human catastrophe at the beginning of the 20th century. The war caused unprecedented disasters to the people of all countries. The warring parties mobilized a total of 73.4 million troops, more than 29 million troops directly involved in the war, about 10 million people died in the battlefield, about 20 million people were injured, more than 1.3 billion people were affected by the war, accounting for 75% of the world's total population at that time, and the economic losses caused by the war amounted to 270 billion US dollars.Blood type with leadership ability from an early age2. Press and hold the power key without letting go, and hold and hold the volume reduction key on the left side of the mobile phone at the same time. At this time, the screen will close.