enum Color { Red = "red", Green = "green", Blue = "blue" } 然后,创建一个函数来获取枚举类型。该函数接收一个字符串参数,并返回对应的枚举值。例如,我们创建一个函数getEnumValue: 代码语言:txt 复制 function getEnumValue(str: string): Color | undefined
假设定义了一个这样的枚举类型: enum MyEnum { aa = 1, bb = 2 } 1、字符串转换为枚举: string strA...= "aa"; MyEnum myEnum = (MyEnum)Enum.Parse(typeof(MyEnum), strA); 上面的方法是区分大小写的,也就是说,如果strA的值为“AA...aa"; MyEnum myEnum = (MyEnum)Enum.Parse(typeof(...
: string public name: string = '张三' // public 关键字 可不写 // name: string = '张三' getId() { return this.id } getName() { return } } // 继承 class List extends User { getName() { return } } const user = new User // user.id = 1000 console.log(); // 张三 console...
public static string GetName(Type enumType,Object value) public static string[] GetNames(Type enumType) 比如:Enum.GetName(typeof(Colors),3))与Enum.GetName(typeof(Colors), Colors.Blue))的值都是"Blue" Enum.GetNames(typeof(Colors))将返回枚举字符串数组。 1. 2. 3. 4. 5. 6. 7. 8. ...
而enum 的缺点,就是在一开始提到的:违背了 TypeScript = JavaScript + Types 的构想 比如下面的这段 TS 代码: type DataItem ={ label:string; value: number|string; }; function formatLabels(arr: DataItem[]) {returnArray.isArray(arr) ? arr.map((x) => x.label).join(',') :''; ...
enum Direction { NORTH = 3, SOUTH, EAST, WEST, } 2.字符串枚举 在TypeScript 2.4 版本,允许我们使用字符串枚举。在一个字符串枚举里,每个成员都必须用字符串字面量,或另外一个字符串枚举成员进行初始化。 enum Direction { NORTH = "NORTH",
String enums allow you to give a meaningful and readable value when your code runs, independent of the name of the enum member itself. 自增而来的失去了可读性,所以不支持自增。同理,字符串枚举值本就可读,不再需要反向映射: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 var Direction; (fun...
}// 使用枚举enumResponse{No=0,Yes=1, }functionrespond(recipient:string, message: Response):void{// ...}respond("Princess Caroline",Response.Yes)// 使用计算量初始化的枚举值之后的枚举值不能没有初始化器enumE { A =getSomeValue(),
Enum.isType(enum, value) Enum.isTypechecks if a value is of a given enum type and can be used as a type guard. For example: constColor=Enum("BLACK","WHITE"); type Color=Enum<typeofColor>; letselectedColor:Color; constcolorString=getUserInputString();//Unsanitized string. ...
Enums come in two flavors string and numeric. Lets start with numeric.Numeric Enums - DefaultBy default, enums will initialize the first value to 0 and add 1 to each additional value:ExampleGet your own TypeScript Server enum CardinalDirections { North, East, South, West } let current...