一、定义

1. 函数定义：

function f_add(num_in)    num_in = num_in + 1    f_add = num_inend function

用函数名来返回参数

2. 子例程定义

sub s_add(num_in)    num_in = num_in + 1end sub

子例程没有返回值

二、函数与子例程在参数传递上的差别

函数和子例程调用时可以有两种方式：在括号中指定参数，或使用不带括号的格式。

使用带括号的方式指定参数时，参数是按值传递的，函数或子例程中对参数的修改不会反映到参数中。而用不带括号的格式时，则函数或子例程中对参数值的改动都是实际发生的。

以下代码示范了这两种格式的差别：

num_out = 0wscript.echo "num before sub:", num_out'用不带括号的格式调用子例程s_add num_outwscript.echo "num after sub:", num_outwscript.echo ""num_out = 0wscript.echo "num before sub():", num_out'用带括号的格式调用子例程s_add(num_out)wscript.echo "num after sub():", num_outwscript.echo ""num_out = 0wscript.echo "num before function:", num_out'用不带括号的格式调用函数f_add num_outwscript.echo "num after function:", num_outwscript.echo ""num_out = 0wscript.echo "num before function():", num_out'用带括号的格式调用函数f_add(num_out)wscript.echo "num after function():", num_outwscript.echo ""sub s_add(num_in)    wscript.echo "num in sub", num_in    num_in = num_in + 1    wscript.echo "num in sub", num_inend subfunction f_add(num_in)    wscript.echo "num in function", num_in    num_in = num_in + 1    wscript.echo "num in function", num_in    f_add = num_inend function

输出结果如下

num before sub: 0

num in sub 0

num in sub 1

num after sub: 1

num before sub(): 0

num in sub 0

num in sub 1

num after sub(): 0

num before function: 0

num in function 0

num in function 1

num after function: 1

num before function(): 0

num in function 0

num in function 1

num after function(): 0