加一个拼音可选参数、修复post -d参数时也输出help信息的bug

拼音参数为可选，默认不主动转换为拼音


> The example below parses args and options from process.argv, leaving remaining args as the program.args array which were not consumed by options.

用户没有加任何参数的判断用`jkl.rawArgs.length == 2`比`jkl.args`靠谱