TypeScript:对象类型的索引签名隐式具有"任何"类型

Question

我的功能有问题:

    copyObject<T> (object:T):T {
        var objectCopy = <T>{};
        for (var key in object) {
            if (object.hasOwnProperty(key)) {
                objectCopy[key] = object[key];
            }
        }
        return objectCopy;
    }

我有以下错误:

Index signature of object type implicitly has an 'any' type.

我该如何解决？

Answer 1

class test<T> {
    copyObject<T> (object:T):T {
        var objectCopy = <T>{};
        for (var key in object) {
            if (object.hasOwnProperty(key)) {
                objectCopy[key] = object[key];
            }
        }
        return objectCopy;
    }
}

如果我按如下方式运行代码

c:\Work\TypeScript>tsc hello.ts

它运作正常.但是,以下代码:

c:\Work\TypeScript>tsc --noImplicitAny hello.ts

投

hello.ts(6,17): error TS7017: Index signature of object type implicitly has an 'any' type.
hello.ts(6,35): error TS7017: Index signature of object type implicitly has an 'any' type.

因此,如果禁用noImplicitAny标志,它将起作用.

似乎还有另一个选项,因为tsc支持以下标志:

--suppressImplicitAnyIndexErrors   Suppress noImplicitAny errors for indexing objects lacking index signatures.

这对我也有用:

tsc --noImplicitAny --suppressImplicitAnyIndexErrors hello.ts

更新:

class test<T> {
    copyObject<T> (object:T):T {
        let objectCopy:any = <T>{};
        let objectSource:any = object;
        for (var key in objectSource) {
            if (objectSource.hasOwnProperty(key)) {
                objectCopy[key] = objectSource[key];
            }
        }
        return objectCopy;
    }
}

此代码可以在不更改任何编译器标志的情