ISO8583包（简称8583包）是一个国际标准的包格式，最多由128个字段域组成，每个域都有统一的规定，并有定长与变长之分。8583包前面一段为位图，用来确定包的字段域组成情况。-The ISO8583 package (8583 pack) is an international standard format, and up to 128 field domain, each domain has a unified, and the fixed length and variable length of. 8583 package in front of a bitmap, used to determine the composition of the field.