以下代码可用于在TypeScript中创建enum:

enum e {
    hello = 1,
    world = 2
};

这些值可以通过以下方式访问:

e.hello;
e.world;

我如何创建一个字符串值enum ?

enum e {
    hello = "hello", // error: cannot convert string to e
    world = "world"  // error 
};

当前回答

@basarat的回答很棒。下面是一个你可以使用的简化但有点扩展的例子:

export type TMyEnumType = 'value1'|'value2';

export class MyEnumType {
    static VALUE1: TMyEnumType = 'value1';
    static VALUE2: TMyEnumType = 'value2';
}

console.log(MyEnumType.VALUE1); // 'value1'

const variable = MyEnumType.VALUE2; // it has the string value 'value2'

switch (variable) {
    case MyEnumType.VALUE1:
        // code...

    case MyEnumType.VALUE2:
        // code...
}

其他回答

使用typescript@next中提供的自定义转换器(https://github.com/Microsoft/TypeScript/pull/13940),您可以从字符串字面类型创建字符串值的枚举对象。

请查看我的npm包,ts-transformer-enumerate。

使用示例:

// The signature of `enumerate` here is `function enumerate<T extends string>(): { [K in T]: K };`
import { enumerate } from 'ts-transformer-enumerate';

type Colors = 'green' | 'yellow' | 'red';
const Colors = enumerate<Colors>();

console.log(Colors.green); // 'green'
console.log(Colors.yellow); // 'yellow'
console.log(Colors.red); // 'red'

最近在使用TypeScript 1.0.1时遇到了这个问题,并以这种方式解决了:

enum IEvents {
        /** A click on a product or product link for one or more products. */
        CLICK,
        /** A view of product details. */
        DETAIL,
        /** Adding one or more products to a shopping cart. */
        ADD,
        /** Remove one or more products from a shopping cart. */
        REMOVE,
        /** Initiating the checkout process for one or more products. */
        CHECKOUT,
        /** Sending the option value for a given checkout step. */
        CHECKOUT_OPTION,
        /** The sale of one or more products. */
        PURCHASE,
        /** The refund of one or more products. */
        REFUND,
        /** A click on an internal promotion. */
        PROMO_CLICK
}

var Events = [
        'click',
        'detail',
        'add',
        'remove',
        'checkout',
        'checkout_option',
        'purchase',
        'refund',
        'promo_click'
];

function stuff(event: IEvents):boolean {
        // event can now be only IEvents constants
        Events[event]; // event is actually a number that matches the index of the array
}
// stuff('click') won't work, it needs to be called using stuff(IEvents.CLICK)

小js-hack但工作:e[字符串(e.hello)]

有很多答案,但我没有看到任何完整的解决方案。可接受的答案以及enum {this, one}的问题是,它分散了您碰巧在许多文件中使用的字符串值。我也不太喜欢“更新”,它很复杂,也没有利用类型。我认为Michael Bromley的回答是最正确的,但它的界面有点麻烦,可以用一个类型。

我使用的是TypeScript 2.0。+……这是我会做的

export type Greeting = "hello" | "world";
export const Greeting : { hello: Greeting , world: Greeting } = {
    hello: "hello",
    world: "world"
};

然后像这样使用:

let greet: Greeting = Greeting.hello

在使用有用的IDE时,它还具有更好的类型/悬停信息。缺点是你必须写两次字符串,但至少它只在两个地方。

export enum PaymentType {
                Cash = 1,
                Credit = 2
            }
var paymentType = PaymentType[PaymentType.Cash];