摘要:
1. 新建表中添加索引 ① 普通索引 create table t_dept( no int not null primary key, name varchar(20) null, sex varchar(2) null, info varchar(20) null, index index_no 閱讀全文
摘要:
(function(){ class Animal{ name:string; constructor(name:string){ this.name=name; } sayHello(){ console.log('動物再叫 '); } } class Dog extends Animal { a 閱讀全文