interface 定义数组和字典类型

数组数据的类型

interface StringArray{
    [index:number]:string | number
}
let strarray:StringArray = ['a','b','c',1,23,]

dict类型限制

interface NumberDict{
    [index:string]:number | string,
    length:number,
    name:string
}
let numdict:NumberDict = {
    length:10,
    name:"username"
}