ts---介面

帅到要去报警發表於2024-08-28

ts裡面的介面：

介面是一系列抽象方法的宣告，是一些方法特徵的集合，這些方法都應該是抽象的，需要由具體的類去實現。

例項：

interface IPerson { 
    firstName:string, 
    lastName:string, 
    sayHi: ()=>string 
} 
var customer:IPerson = { 
    firstName:"Tom",
    lastName:"Hanks", 
    sayHi: ():string =>{return "Hi there"} 
} 
console.log("Customer 物件 ") 
console.log(customer.firstName) 
console.log(customer.lastName) 
console.log(customer.sayHi())  

var employee:IPerson = { 
    firstName:"Jim",
    lastName:"Blakes", 
    sayHi: ():string =>{return "Hello!!!"} 
} 
 
console.log("Employee  物件 ") 
console.log(employee.firstName) 
console.log(employee.lastName)

聯合型別介面：

interface RunOptions { 
    program:string; 
    commandline:string[]|string|(()=>string); 
} 
 
// commandline 是字串
var options:RunOptions = {program:"test1",commandline:"Hello"}; 
console.log(options.commandline)  
 
// commandline 是字串陣列
options = {program:"test1",commandline:["Hello","World"]}; 
console.log(options.commandline[0]); 
console.log(options.commandline[1]);  
 
// commandline 是一個函式表示式
options = {program:"test1",commandline:()=>{return "**Hello World**";}}; 
 
var fn:any = options.commandline; 
console.log(fn());

陣列型別的介面：

interface namelist { 
   [index:number]:string 
} 
// 型別一致，正確
var list2:namelist = ["Google","Runoob","Taobao"]
// 錯誤元素 1 不是 string 型別
// var list2:namelist = ["Runoob",1,"Taobao"]

介面繼承：可以透過繼承其他介面來擴充自己。

interface Person { 
   age:number 
} 
 
interface Musician extends Person { 
   instrument:string 
} 
 
var drummer = <Musician>{}; 
drummer.age = 27 
drummer.instrument = "Drums" 
console.log("年齡:  "+drummer.age)
console.log("喜歡的樂器:  "+drummer.instrument)

多繼承：

interface IParent1 { 
    v1:number 
} 
 
interface IParent2 { 
    v2:number 
} 
 
interface Child extends IParent1, IParent2 { } 
var Iobj:Child = { v1:12, v2:23} 
console.log("value 1: "+Iobj.v1+" value 2: "+Iobj.v2)

打完收工！

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