The syntax for specifying a single hexadecimal value is mnemonic where NN is a hexadecimal digit in the range 00 to FF.
用于指定单个十六进制值的语法为助记符 ，其中 NN 为从 00 到 FF 的十六进制数字。
The escape function replaces almost any non-alphanumeric ASCII character with % followed by the two-digit hexadecimal code of the encoded character.
escape函数用%后跟被编码字符的两位16进制码代替了几乎所有非字母数字的ASCII字符。
However, more than half of the iPhone applications studied collected the device id-a 40-digit hexadecimal number identifying a particular phone.
然而，研究中一半以上的iPhone应用程序收集设备ID——一个由40个16进制数表示一个特定的电话。
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