command /addxp [<number>] [<offline player>]:
    permission: skript.addxp
    trigger:
        if arg 1:
            send "&a"
            add 3 to {xp.%uuid of player%}
        if arg 1 or arg 2 is not set:
            send "&c使用方法: /addxp <xp> <player>"

on death of player:
    execute console command "addxp 3 %attacker%"
    send "&b+ 3xp"