io:write/2
打印输出一个 Erlang 项元
用法：
write(IoDevice, Term) -> ok
向指定输出端 IoDevice 打印输出一个 Erlang 项元 Term
{ok, IoDevice} = file:open("test.txt", [write]),
io:write(IoDevice, 'Just a test!'),
file:close(IoDevice).
打印输出一个 Erlang 项元
用法：
write(IoDevice, Term) -> ok
向指定输出端 IoDevice 打印输出一个 Erlang 项元 Term
{ok, IoDevice} = file:open("test.txt", [write]),
io:write(IoDevice, 'Just a test!'),
file:close(IoDevice).