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
};
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
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)
其他回答
为什么不直接使用本地方式访问枚举的字符串呢?
enum e {
WHY,
NOT,
USE,
NATIVE
}
e[e.WHY] // this returns string 'WHY'
打印稿0.9.0.1
enum e{
hello = 1,
somestr = 'world'
};
alert(e[1] + ' ' + e.somestr);
打印稿操场
TypeScript 2 + 4。
你现在可以直接将字符串值分配给enum成员:
enum Season {
Winter = "winter",
Spring = "spring",
Summer = "summer",
Fall = "fall"
}
更多信息见#15486。
打印稿1.8 +
在TypeScript 1.8+中,你可以创建一个字符串文字类型来定义类型,并为值列表创建一个同名的对象。它模仿字符串enum的预期行为。
这里有一个例子:
type MyStringEnum = "member1" | "member2";
const MyStringEnum = {
Member1: "member1" as MyStringEnum,
Member2: "member2" as MyStringEnum
};
它将像字符串enum一样工作:
// implicit typing example
let myVariable = MyStringEnum.Member1; // ok
myVariable = "member2"; // ok
myVariable = "some other value"; // error, desired
// explict typing example
let myExplicitlyTypedVariable: MyStringEnum;
myExplicitlyTypedVariable = MyStringEnum.Member1; // ok
myExplicitlyTypedVariable = "member2"; // ok
myExplicitlyTypedVariable = "some other value"; // error, desired
确保输入对象中的所有字符串!如果不这样做,那么在上面的第一个例子中,变量将不会隐式地类型化为MyStringEnum。
如果你想要的主要是易于调试(相当类型检查),不需要为枚举指定特殊值,这是我正在做的:
export type Enum = { [index: number]: string } & { [key: string]: number } | Object;
/**
* inplace update
* */
export function enum_only_string<E extends Enum>(e: E) {
Object.keys(e)
.filter(i => Number.isFinite(+i))
.forEach(i => {
const s = e[i];
e[s] = s;
delete e[i];
});
}
enum AuthType {
phone, email, sms, password
}
enum_only_string(AuthType);
如果您希望支持遗留代码/数据存储,则可以保留数字键。
这样,您就可以避免键入两次值。
你可以在最新的TypeScript中使用字符串枚举:
enum e
{
hello = <any>"hello",
world = <any>"world"
};
来源:https://blog.rsuter.com/how-to-implement-an-enum-with-string-values-in-typescript/
更新- 2016
最近我在React中使用的一种更健壮的方法是这样的:
export class Messages
{
static CouldNotValidateRequest: string = 'There was an error validating the request';
static PasswordMustNotBeBlank: string = 'Password must not be blank';
}
import {Messages as msg} from '../core/messages';
console.log(msg.PasswordMustNotBeBlank);