Interface 接口基本使用

作为函数的参数类型的定义

interface labelobj{
    label:string
}
function printLabel(lableObject: labelobj){
    console.log(lableObject)
}
printLabel({label:"label"})

可选参数使用 ？

interface labelobj{
    label:string
    width?: number
}

function printLabel(lableObject: labelobj){
    console.log(lableObject)
}

printLabel({label:"label"})
printLabel({label:'abc',width:10})

readonly 不能修改的值

interface Point{
    readonly x:number
    readonly y:number
}

let p1:Point = {x:10,y:5}
p1.x = 20  // Cannot assign to 'x' because it is a read-only property.