在 GameMaker 中制作游戏时，我遇到了未设置变量的问题，我不知道为什么。当按下 W、A、S 或 D 并单击 LMB 时，它可以工作，但如果我按下 W、A、S 或 D 然后松开然后单击 LMB，则会崩溃。
代码：
var look
var bullet
if (keyboard_check(ord("A"))){
x = x - 5;
sprite_index = spr_west_hiro
image_xscale = 3
image_yscale = 3
look = 180
} else if (keyboard_check(ord("D"))){
x = x + 5;
sprite_index = spr_east_hiro
image_xscale = 3
image_yscale = 3
look = 0
} else if (keyboard_check(ord("S"))){
y = y + 5;
sprite_index = spr_south_hiro
image_xscale = 3
image_yscale = 3
look = 270
} else if (keyboard_check(ord("W"))){
y = y - 5;
sprite_index = spr_north_hiro
image_xscale = 3
image_yscale = 3
look = 90
}
//------------------------------------------------------------------------------
if (keyboard_check_released(ord("A"))){
sprite_index = spr_idlewest_hiro
image_xscale = 3
image_yscale = 3
look = 180
} else if (keyboard_check_released(ord("D"))){
sprite_index = spr_idleast_hiro
image_xscale = 3
image_yscale = 3
look = 0
} else if (keyboard_check_released(ord("S"))){
sprite_index = spr_idlesouth_hiro
image_xscale = 3
image_yscale = 3
look = 270
} else if (keyboard_check_released(ord("W"))){
sprite_index = spr_idlenorth_hiro
image_xscale = 3
image_yscale = 3
look = 90
}
//--------------------------------------------------------------------------------
if (mouse_check_button_pressed(mb_left)){
var bullet = instance_create_layer(x,y, "Instances", obj_bullet)
bullet.direction = look
}
错误：
ERROR!!! :: ############################################################################################
FATAL ERROR in
action number 1
of Step Event0
for object obj_hiro:
local variable look(100001, -2147483648) not set before reading it.
at gml_Object_obj_hiro_Step_0 (line 61) - bullet.direction = look
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Object_obj_hiro_Step_0 (line 61)
我已经多次查看代码，但我仍然很难过。特别是因为看起来变量似乎没有保存设置给它的系数，尽管事实上它应该在 W、A、S 或 D 被按下然后释放时保存。