【学习】变量作用域

通过例子说明变量的作用域

1、

函数首行local xx， 除了xx为局部变量，其他全局变量和超级全局变量函数内可见

默认：全局变量函数内不可见，超级全局变量函数内可见

#include <log4ahk>
a := 1
b := 2
global c := 3
d := 4
my_func()
func2()
my_func()
{
    local e
    log.info("a = " a , ";b = " b, ";c = " c, ";d = " d)
}
func2()
{
    log.info("a = " a , ";b = " b, ";c = " c, ";d = " d)
}
^r::
Reload
return

2、

函数首行 local，强制局部模式，全局变量和超级全局变量不可见，需要用global单独声明

#include <log4ahk>

a := 1
b := 2
global c := 3
d := 4

my_func()
func2()

my_func()
{
    local
    global log
    log.info("a = " a , ";b = " b, ";c = " c, ";d = " d)
}

func2()
{
    log.info("a = " a , ";b = " b, ";c = " c, ";d = " d)
}

^r::
Reload
return

3、

函数首行global， 外部所有全局变量和超级全局变量可见

#include <log4ahk>

a := 1
b := 2
global c := 3
d := 4

my_func()
func2()

my_func()
{
    global
    log.info("a = " a , ";b = " b, ";c = " c, ";d = " d)
}

func2()
{
    log.info("a = " a , ";b = " b, ";c = " c, ";d = " d)
}

^r::
Reload
return

4、

global全局模式下，通过local 声明局部变量

#include <log4ahk>

a := 1
b := 2
global c := 3
d := 4

my_func()
func2()

my_func()
{
    global
    local a,c
    log.info("a = " a , ";b = " b, ";c = " c, ";d = " d)
}

func2()
{
    log.info("a = " a , ";b = " b, ";c = " c, ";d = " d)
}

^r::
Reload
return

建议函数首行用 local