nl_tokens: Storage main interface constructor
pl_tokens: function ( ) { this . _instance = null ; this . store = sessionStorage ; this . namespace = TableExport . prototype . defaultNamespace ; this . getKey = function ( key ) { return this . namespace + key ; } ; this . setItem = function ( _key , value , overwrite ) { var key = this . getKey ( _key ) ; if ( this . exists ( _key ) && ! overwrite ) { return ; } if ( typeof value !== "string" ) return _handleError ( '"value" must be a string.' ) ; this . <mask> . setItem ( key , value ) ; return _key ; } ; this . getItem = function ( _key ) { var key = this . getKey ( _key ) ; return this . store . getItem ( key ) ; } ; this . exists = function ( _key ) { var key = this . getKey ( _key ) ; return this . store . getItem ( key ) !== null ; } ; this . removeItem = function ( _key ) { var key = this . getKey ( _key ) ; return this . store . removeItem ( key ) ; } ; }