一文看懂ascii,unicode,utf8编码规则 - 知乎
utf-8和unicode之间有什么关系?-php教程-php中文网
utf-8是unicode的一种变长字符编码又称万国码
3,unicode字符集中的utf-8编码方式
编码之ascii,utf-8(unicode),gbk,gb2312
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