能进行文本文件的读写操作，所有单词均放入文本文件中，进行检索和计数操作。单词的检索(返回为该单词在文本文件中的位置,可能多个,需返回多个位置)和计数(计数包括单词检索时的个数和全部单词的个数计数)。-Can read and write text files to operate, all the words are Add text file for retrieval and counting operation. Word search (back to the words in the text file, possibly more than the need to return multiple locations) and the count (count includes the number of word retrieval when the number of words and all count).