四个字节数据与float的相互转化。前后次序可调整。便于理解float数据格式实际存储为4个字节时再内存中的排序。也可以用在通讯中验证通讯数据的格式。

B1，B2，B3，B4 -》float（B+B+B+B）-Interconversion four bytes of data and float. Before and after the order is adjustable. Easy to understand format float data is actually stored as 4 bytes of memory, then the sort. You can also verify the format used in the communication traffic data.