  In this paper, general higher-order rogue wave solutions of the parity-time
($\mathcal {P}\mathcal {T}$) symmetric scalar and coupled nonlocal nonlinear
Schr\"{o}dinger equations (NLSEs) are calculated theoretically via a Darboux
transformation by a separation of variable technique. Furthermore, in order to
understand these solutions better, the main characteristics of the obtained
solutions are explored clearly and conveniently. Our results show that the
dynamics of these solutions exhibits rich patterns, most of which have no
counterparts in the corresponding local equations.
