BaaN系统无法显示长字串，必须分割成短的字串，由于字串编码不同，不能简单切割，造成半个字符；此函数的功能就是将长字串正确切割成短的字串-BaaN system can t display long string,need divide into multi short string, for exists more than one charater code in a string, can t split by simple firmly　use it can split without error