nl_tokens: 代理回调函数
pl_tokens: function ( result ) { if ( <mask> && result . headers ) { result . headers [ 'x-cos-version-id' ] && ( result . VersionId = result . headers [ 'x-cos-version-id' ] ) ; result . headers [ 'x-cos-delete-marker' ] && ( result . DeleteMarker = result . headers [ 'x-cos-delete-marker' ] ) ; } return result ; }