What does World of Warcraft Macro mean?

Your macro is incomplete. Complete the following \x0d\/cast [@ mouseover, Exists, Help] [@ target, Exists, Help] [@ target, Exists, Help] [@ player] holy light \ x0d \ means: \x0d\ 1, 0. \x0d\2。 If there is no mouse pointing, use holy light \x0d\3 for the current friendly target. If the current target is the enemy, use holy light on the enemy target. \x0d\4。 If there is no goal at present, use the holy light on yourself.