实现类字典类

Question

这不可能吗？

interface IDictionary {
    [index: string]: string;
}

class Dictionary implements IDictionary {
    public foo = "bar";
}

相反，我得到了错误：

TS2420:Class 'Dictionary' incorrectly implements 'IDictionary'. Index signature is missing in type 'Dictionary'.

Answer 1

因为你实现了一个接口

interface IDictionary {
    [index: string]: string;
}

class Dictionary implements IDictionary {
    public foo = "bar";
}

您需要提供所有要求

interface IDictionary {
    [index: string]: string;
}

class Dictionary implements IDictionary {
    public foo = "bar";
    [index: string]: string;
}