以行为单位把字符串中的第一个字符的ASCII值加第二个字符的ASCII值，得到一个新的字符，第二个加上第三个的ASCII值，得到第二个新字符，以此类推一直处理到倒数第二个字符，最后一个字符加上第一个字符的ASCII值，最后得到一个新字符，将处理后的字符串放在原来的位置上。-On action unit of the first character in the string ASCII value added a second ASCII value of the characters, get a new character, the second and third ASCII value, get the second new characters, processing and so on until the last but one character at a time, and finally a character with the first character of the ASCII value, finally got a new characters, strings that will be processed in the original position