fw写入文本

用法：

将文本数据写入至SD卡根目录的：造梦空间.txt文件里面

s a = "%造梦空间.txt"
s b = "造梦空间官网：blog.zmkj.cn"
fw(a, b)
s a = "%造梦空间.txt"

s b = "造梦空间官网：blog.zmkj.cn"

fw(a, b)
s a = "%造梦空间.txt"

s b = "造梦空间官网：blog.zmkj.cn"

fw(a, b)

s a = "%造梦空间.txt"
s b = "造梦空间官网：blog.zmkj.cn"
s c = "utf-8"
fw(a, b, c)
s a = "%造梦空间.txt"

s b = "造梦空间官网：blog.zmkj.cn"

s c = "utf-8"

fw(a, b, c)
s a = "%造梦空间.txt"

s b = "造梦空间官网：blog.zmkj.cn"

s c = "utf-8"

fw(a, b, c)

说明：

用于写入文件。