As of VaultAPI 1.4 use playerAdd(String, OfflinePlayer, String) instead.
从VaultAPI 1.4开始使用playerAdd(String, OfflinePlayer, String)替代
Add permission to a player.
Supports NULL value for World if the permission system registered supports global permissions.
But May return odd values if the servers registered permission system does not have a global permission store.
添加权限给玩家
支持将世界设为null值如果权限系统支持全局权限的话
但是如果权限系统不支持则可能返回异常值