指定字符数换行，自动过滤汉字意外的符号字母等-Specified number of characters to wrap automatically filter the symbol of the Chinese characters unexpected letters

本例实现了写出内容到txt文件中，以当天日期命名，没写一次自动换行。-This example implements write content to the txt file, named with the date to the day, I did not write a wrap.