ASCII共定义了256个代码(从0-255),从0-32位为控制字符(ASCII control characters),从33-127位为可打印字符(ASCII printable characters)。从0-127是标准的ASCII编码,从128-255是扩展的ASCII编码。
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The last set of characters is the excluded set. It is made up of all ASCII control characters, the space character as well the following characters (known as delimiters)
最后一组的字符集是例外字符集。它是由所有的ASCII控制字符组成,包含空格字符以及下列字符(称为分隔符)
ASCII device control characters were originally designed to control hardware devices like printers and tape drives. These characters have nothing to do inside any HTML document.
ASCII设备控制字符最初是用于控制硬件设备的,如:打印机、录音设备。这个字符不属于HTML文档。
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