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
打印稿0.9.0.1
enum e{
hello = 1,
somestr = 'world'
};
alert(e[1] + ' ' + e.somestr);
打印稿操场
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)
Typescript中的字符串枚举:
字符串枚举是一个类似的概念,但是有一些细微的运行时差异,如下文所述。在string enum中,每个成员必须用string字面值或另一个string enum成员常量初始化。
enum Direction {
Up = "UP",
Down = "DOWN",
Left = "LEFT",
Right = "RIGHT",
}
虽然字符串枚举没有自动递增的行为,但字符串枚举的好处是它们很好地“序列化”。换句话说,如果你正在调试并且必须读取一个数值enum的运行时值,这个值通常是不透明的——它本身没有传达任何有用的含义(尽管反向映射通常会有所帮助),字符串enum允许你在代码运行时给出一个有意义且可读的值,与枚举成员本身的名称无关。 参考链接如下。
在这里输入链接描述
//to access the enum with its string value you can convert it to object
//then you can convert enum to object with proberty
//for Example :
enum days { "one" =3, "tow", "Three" }
let _days: any = days;
if (_days.one == days.one)
{
alert(_days.one + ' | ' + _days[4]);
}
小js-hack但工作:e[字符串(e.hello)]