for循环可以指定循环次数重复执行程序下面程序利用for循环实现了呼吸灯的效果注意for循环步长,如果是由小到大则为正数,反之为负数i02551110idelay5i2541-1110idelay5dm9pZCBzZXR1cCgpewogIHBpbk1vZGUoMTEsIE9VVFBVVCk7Cn0KCnZvaWQgbG9vcCgpewogIC8vZm9y5b6q546v5Y+v5Lul5oyH5a6a5b6q546v5qyh5pWw6YeN5aSN5omn6KGM56iL5bqPCiAgLy/kuIvpnaLnqIvluo/liKnnlKhmb3Llvqrnjq/lrp7njrDkuoblkbzlkLjnga/nmoTmlYjmnpwKICAvL+azqOaEj2ZvcuW+queOr+atpemVv++8jOWmguaenOaYr+eUseWwj+WIsOWkp+WImeS4uuato+aVsO+8jOWPjeS5i+S4uui0n+aVsAogIGZvciAoaW50IGkgPSAwOyBpIDw9IDI1NTsgaSA9IGkgKyAoMSkpIHsKICAgIGFuYWxvZ1dyaXRlKDExLCBpKTsKICAgIGRlbGF5KDUpOwogIH0KICBmb3IgKGludCBpID0gMjU0OyBpID49IDE7IGkgPSBpICsgKC0xKSkgewogICAgYW5hbG9nV3JpdGUoMTEsIGkpOwogICAgZGVsYXkoNSk7CiAgfQoKfQ==