Enum标志在JavaScript中 [英] Enum flags in JavaScript

问题描述

我需要在Javascript中模拟枚举类型，并且方法似乎很简单：

  var MyEnum = {Left = 1;右= 2;顶= 4; Bottom = 8} 
  

现在，在C＃中，我可以组合这样的值：

  MyEnum left_right = MyEnum.Left | MyEnum.Right 
  

然后我可以测试枚举是否具有一定的值：

  if（left_right& MyEnum.Left == MyEnum.Left）{...} 
  

我可以在Javascript中执行类似的操作吗？

解决方案

javascript你应该可以将它们组合成：

  var left_right = MyEnum.Left | MyEnum.Right; 
  

然后测试将完全与您在

  if（（left_right& MyEnum.Left）== MyEnum.Left）{...} 
  

I need to emulate enum type in Javascript and approach seems pretty straight forward:

var MyEnum = {Left = 1; Right = 2; Top = 4; Bottom = 8}

Now, in C# I could combine those values like this:

MyEnum left_right = MyEnum.Left | MyEnum.Right

and then I can test if enum has certain value:

if (left_right & MyEnum.Left == MyEnum.Left) {...}

Can I do something like that in Javascript?

解决方案

In javascript you should be able to combine them as:

var left_right = MyEnum.Left | MyEnum.Right;

Then testing would be exactly as it is in your example of

if ( (left_right & MyEnum.Left) == MyEnum.Left) {...}

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