1-7 命名空间

使用命名空间，避免变量名，函数名，类名重复。

一、使用命名空间定义变量

namespace A{
   export var a =10;
}
namespace B{
   export var a = 20;
}
console.log(A.a)
console.log(B.a)

二、使用命名空间定义类

namespace A{
    export class Person{
        name:string|undefined;
        age:number|undefined;
        constructor(name:string,age:number){
            this.name = name;
            this.age = age;
        }
    }
}
namespace B{
    export class Person{
        name:string|undefined;
        age:number|undefined;
        constructor(name:string,age:number){
            this.name = name;
            this.age = age;
        }
    }
}
var cheng = new A.Person("cheng",18);
var jiang = new B.Person("jiang",20);
console.log(cheng);
console.log(jiang)

三、命名空间模块化

module/db.ts
export namespace A{
    export class Person{
        name:string|undefined;
        age:number|undefined;
        constructor(name:string,age:number){
            this.name = name;
            this.age = age;
        }
    }
}

import {A} from './modules/db';
var cheng = new A.Person("cheng",20);