nl_tokens: 分析文件的 hash
pl_tokens: function ( options ) { var me = this ; var filter = options && options . filter ; return me . custom ( function ( file , callback ) { if ( ! filter || ! filter ( <mask> ) ) { var filePath = file . path ; var hash = me . hashMap [ filePath ] ; hash = md5 ( file . contents ) ; me . hashMap [ filePath ] = hash ; } callback ( ) ; } ) ; }