代码功能：文件中的词频检测，一个文件中存储待检测文本，另一个文件中存储检测的单词，且单词可为多个，检测中单词的单复数为同一单词，且能检测数字、数字与字母组合的单词- Code Function: document word frequency detection, a file stored text to be detected, another file storage detection of words, and words can be multiple, detection of