blockchain - ruby - string to hex to ascii , pack(H*), unpack(H*)
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ruby可以进行转换：
https://stackoverflow.com/questions/22957688/convert-string-with-hex-ascii-codes-to-characters
"a".unpack "H*" # => ["61"]
["61"].pack "H*" # => "a"
参考：http://facweb.cs.depaul.edu/sjost/it212/documents/ascii-pr.htm
下面是ASCII的对应表：
