验证证的方法是写code.例如以下: public class test { static class A { public static String name = "hello"; static { System.out.println("A static block1"); //1 } { System.out.println("A block3"); //3 } public A() { System.out.println("
l = [] for i in xrange(10): l.append({‘num’:i}) print l在考虑以下代码,运行结束后的结果是什么? l = [] a = {‘num’:0} for i in xrange(10): a[‘num’] = i l.append(a) print l以上两段代码的运行结果是否相同,如果不相同,原因是什么? 上方代码的结果: 1. [{‘num’:0},{‘num’:1},{‘num’:2},{‘num’:3},{‘num’:4},{‘num
问题:E:\BladeXDB\Saber>yarn run serveyarn run v1.13.0$ vue-cli-service serve'vue-cli-service' 不是内部或外部命令,也不是可运行的程序或批处理文件.error Command failed with exit code 1.info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command. 解决方法 :E:\