javascript – “[index：string]”：打字稿中的IFoo表示法

export interface IBar {
   [index : String] : IFoo;
}

export interface IFoo {
        CharacterName: String;
        DisplayName: String;
    }

它用于显示索引接口实例时的结果类型.当IBar类型的元素用字符串索引时,即[someString]
结果将是IFoo类型.
例如：

export interface IBar {
   [index : String] : IFoo;
}

export interface IFoo {
        CharacterName: String;
        DisplayName: String;
    }


var x:IBar; 
var y=x['asdf']; // Same as var y:IFoo = x['asdf']

更多：http://blogs.msdn.com/b/typescript/archive/2013/01/24/interfaces-walkthrough.aspx转到标题“描述可转位对象”