nl_tokens: 获取签名
pl_tokens: function getAuth ( params ) { var self = this ; return util . getAuth ( { SecretId : params . SecretId || this . options . SecretId || '' , SecretKey : params . SecretKey || this . options . SecretKey || '' , Method : params . Method , Key : params . Key , Query : params . Query , Headers : params . Headers , Expires : params . Expires , UseRawKey : self . <mask> . UseRawKey , SystemClockOffset : self . options . SystemClockOffset , } ) ; }