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.
17. Chain of Responsibility)
Ctrl + P: Print current graphic
就算张家的亲戚、朋友来了，林大爷也都是认识的，他会亲自带着他们去张家。
通过田小姐在纽约一年半的留学经历，从一个枕头和一个箱子开始，独自打拼，到在纽约游刃有余，小有成绩的一段人生经历，传达“独立女性”的价值观。
The process of solving crimes:
接着，监狱长却给郑树森安排了为庞德送饭的差事，两年的相处，郑树森竟然和庞德成了朋友。面临死刑的庞德要求郑树森做执行枪决的刽子手。痛苦的郑树森在闭着眼睛亲手“枪毙”了庞德之后，辞
蔡浩志(浩子饰演)，在结婚当天居然逃婚跑去当兵，气得父亲大发雷霆，表示会客日一定要他如期和未婚妻(张嘉心饰演)完婚。浩志真的会创下纪录，在成功岭当新郎吗？
那位大哥绝对想不到，更多年以前，这个战术曾经发挥过这样的光亮。
老将军事先定下奇计，心中定有乾坤。
It was January 2016. Abramovich, a 29-year-old Uighur youth, stood in front of the counter of Beijing Agricultural Bank of China and once again did not withdraw the money. The reason is only that there is a "dot" in his name.
"Wenchuan earthquake saved me." He said.
Since the beginning of this year, some Western politicians have spared no effort in the international public opinion field to throw various public opinion shells at the South China Sea issue. By July, the South China Sea had been stirred up by some people who were hiding evil intentions. At that moment, we realized that in the international public opinion arena, since some people are outspoken out of some kind of intention, we will use news facts to make them speechless. As the "national team" of international news reports, the editors and reporters of Xinhua News Agency's International Department concentrate on studying and judging the situation, aiming at their opponents and exerting their power accurately. We pulled out three swords to compete for the international voice.
一众武将跪伏在地，恭迎越王到来。
都是管家纵坏了他，稍微管教严厉一些，他就哭闹不依，再不就跑出去不回家。
尹旭心中暗笑：陈平果然好手段，这样在道义上便把项羽和其他诸侯限制住。
So far, a simple file upload program has been written. Of course, this is still a counterexample. The disadvantage here is the same as the first code in the light example. The program is full of if and else conditional branches. The state and behavior are coupled in a huge method. It is difficult to modify and extend this state machine. This problem is exacerbated by the complexity of the links between file states
身旁副将惊道：那该如何？末将去城西支援？不必，两边我们投入的兵力都是相同的，鬼倭不分强弱，哪边都要死守。
