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Extended Data: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.So at the moment, We're on another machine, Use the ping command to send a message to the current machine. As shown in the following figure, the ping command can be responded to, proving that the message sent by the ping command has been normally sent to the host where the firewall is located. The IP address of the machine where the ping command is located is 146, and the IP address of the host currently testing the firewall is 156. We will use this environment to demonstrate the operation of iptables.　　温丝莱特饰演的马雷·希恩是一名住在宾夕法尼亚州小镇上的侦探，她的生活因调查一起当地谋杀案而分崩离析。皮尔斯饰演的理查德·瑞安，是一位造访小镇的写作教授，25年前他写了一部登峰造极的小说，获得了美国国家图书奖，只是他从未实现自己早年的承诺。就在此时，魔法少女之间开始流传某个传闻。《山海经之赤影传说》海报