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HTTP The Definitive Guide Early web pioneers tried using the IP address of the client as a form of identification. This scheme works if each user has 阅读全文
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用户信息通过HTTP头部承载:不能实现用户唯一性标识。 w HTTP The Definitive Guide Table 11-1 shows the seven HTTP request headers that most commonly carry information about the 阅读全文
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w服务器要知道和谁在交谈。 HTTP The Definitive Guide Web servers may talk to thousands of different clients simultaneously. These servers often need to keep track 阅读全文
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0-服务器识别用户的目的:服务器存有不同用户的信息,而对这些信息,服务器自身、网站开发管理者、网站访问者会对其读写; 1-暂且存入服务器数据库,购物车分为2种表:购物车入车表和购物车下单表; 2-单个客户的购物车是只有一个,状态具有单一时刻,或者说,当前唯一性,其中入车表一个客户的一种商品数量大于1 阅读全文
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w元素的上的下。 阅读全文
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w调用函数次数的计算。 JavaScript: The Good Parts 4.15. Memoization Functions can use objects to remember the results of previous operations, making it possible 阅读全文