入门试验代码，可能这几个试验代码的前面启动不风都是一样的但是中间的不风还是有写不一样的，这个时很基本的入门试验，点亮LED-entry test code, this may be a few test code does not start ahead of the wind are the same but the middle of the wind was still not the same, at the very basi