百里测试开发的博客 Select S#,Sname from (select Student.S#,Student.Sname,score ,(select score from SC SC_2 where SC_2.S#=Student.S# and SC_2.C#='002') score2 from Student,SC where Student.S#=SC.S# and C#='001') S_2 ...
master_chenchengg的博客默认情况下,对自定义类的实例只会返回,这对调试很不友好——我明明是个User实例,你非说我是普通Object?ES6引入了// 定义Symbol.toStringTag getterconst user = new User("李四");// 甚至普通对象也能用看到没,...