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Symantec is a well-known set of powerful anti-virus and network security software, which is an update to its product virus definition library.Some common actions are listed here, and later articles will give detailed examples and summaries of them:(2). AddEventListener () and attachEvent ():-Z) T # Q $a +? 9 H 'u; P-3D Material Library二十世纪六十年代，在“黑云压城城欲摧”的国际形势下，毛主席一声号令：好人好马上三线。军人后代张力军、农民的儿子马朝阳、“资本家千金”陆若文和留苏归来的向晴等这些充满斗志和激情的年轻人，来到了大西南的崇山峻岭，用生命和青春实践自己的理想同时，又演绎着牵肠挂肚的爱情角逐。 一口京腔的大工匠刘连柱因为爱徒梁玉强喜欢上陆若文，竟要断了师徒关系。直到梁玉强在发射基地因排除故障而牺牲，刘连柱都不肯原谅。但谁也不敢相信，害了他爱徒陆若文居然能请他再次出山，为远程火箭试飞成功一显身手。一生梦想当将军的张力军不幸英年早逝，临终，司令员才发现这个一身毛病的小子却有很多不为人知的贡献。马朝阳出席了全国科技大会，火箭伺服系统的研发成果获得最高奖项，在张力军的坟头，闪光的奖章证明了他生命的意义和价值。Next, we will enter the code writing phase of the state mode. First, we will define three state classes, namely offLightState, WeakLightState and strongLightState. All three classes have a prototype method buttonWasPressed, which represents the behavior that will occur when the button is pressed in their respective states. The code is as follows: