以下内容是否会使对象满足枚举在JavaScript中的所有特性?类似于:

my.namespace.ColorEnum = {
  RED : 0,
  GREEN : 1,
  BLUE : 2
}

// later on

if(currentColor == my.namespace.ColorEnum.RED) {
  // whatever
}

还是有其他方法可以做到这一点?


当前回答

我编写了enumeranjs一个非常小的库来解决这个问题,它确保了类型安全,允许枚举常量从原型继承,保证枚举常量和枚举类型是不可变的+许多小特性。它允许重构大量代码,并在枚举定义中移动一些逻辑。下面是一个示例:

var CloseEventCodes = new Enumeration("closeEventCodes", {
  CLOSE_NORMAL:          { _id: 1000, info: "Connection closed normally" },
  CLOSE_GOING_AWAY:      { _id: 1001, info: "Connection closed going away" },
  CLOSE_PROTOCOL_ERROR:  { _id: 1002, info: "Connection closed due to protocol error"  },
  CLOSE_UNSUPPORTED:     { _id: 1003, info: "Connection closed due to unsupported operation" },
  CLOSE_NO_STATUS:       { _id: 1005, info: "Connection closed with no status" },
  CLOSE_ABNORMAL:        { _id: 1006, info: "Connection closed abnormally" },
  CLOSE_TOO_LARGE:       { _id: 1009, info: "Connection closed due to too large packet" }
},{ talk: function(){
    console.log(this.info); 
  }
});


CloseEventCodes.CLOSE_TOO_LARGE.talk(); //prints "Connection closed due to too large packet"
CloseEventCodes.CLOSE_TOO_LARGE instanceof CloseEventCodes //evaluates to true

枚举基本上是一个工厂。

此处提供完整记录的指南。希望这有帮助。

其他回答

如果您使用的是Backbone,则可以使用Backbone.Collection免费获得完整的枚举功能(按id、名称和自定义成员查找)。

// enum instance members, optional
var Color = Backbone.Model.extend({
    print : function() {
        console.log("I am " + this.get("name"))
    }
});

// enum creation
var Colors = new Backbone.Collection([
    { id : 1, name : "Red", rgb : 0xFF0000},
    { id : 2, name : "Green" , rgb : 0x00FF00},
    { id : 3, name : "Blue" , rgb : 0x0000FF}
], {
    model : Color
});

// Expose members through public fields.
Colors.each(function(color) {
    Colors[color.get("name")] = color;
});

// using
Colors.Red.print()

我修改了Andre“Fi”的解决方案:

  function Enum() {
    var that = this;
    for (var i in arguments) {
        that[arguments[i]] = i;
    }
    this.name = function(value) {
        for (var key in that) {
            if (that[key] == value) {
                return key;
            }
        }
    };
    this.exist = function(value) {
        return (typeof that.name(value) !== "undefined");
    };
    if (Object.freeze) {
        Object.freeze(that);
    }
  }

测试:

var Color = new Enum('RED', 'GREEN', 'BLUE');
undefined
Color.name(Color.REDs)
undefined
Color.name(Color.RED)
"RED"
Color.exist(Color.REDs)
false
Color.exist(Color.RED)
true

你可以尝试使用https://bitbucket.org/snippets/frostbane/aAjxM.

my.namespace.ColorEnum = new Enum(
    "RED = 0",
    "GREEN",
    "BLUE"
)

它应该工作到ie8。

从1.8.5开始,可以密封和冻结物体,因此定义如下:

const DaysEnum = Object.freeze({"monday":1, "tuesday":2, "wednesday":3, ...})

or

const DaysEnum = {"monday":1, "tuesday":2, "wednesday":3, ...}
Object.freeze(DaysEnum)

瞧!JS枚举。

然而,这并不能阻止您为变量赋值,这通常是enums的主要目标:

let day = DaysEnum.tuesday
day = 298832342 // goes through without any errors

确保更强的类型安全性(使用enums或其他)的一种方法是使用TypeScript或Flow等工具。

不需要引用,但我保留了它们以保持一致性。

更新

我认为我下面的答案不再是用JavaScript编写枚举的最佳方法。有关更多详细信息,请参阅我的博客文章:JavaScript中的枚举。


已经可以提醒名称:

if (currentColor == my.namespace.ColorEnum.RED) {
   // alert name of currentColor (RED: 0)
   var col = my.namespace.ColorEnum;
   for (var name in col) {
     if (col[name] == col.RED)
       alert(name);
   }
}

或者,您可以创建值对象,这样您就可以吃蛋糕了:

var SIZE = {
  SMALL : {value: 0, name: "Small", code: "S"}, 
  MEDIUM: {value: 1, name: "Medium", code: "M"}, 
  LARGE : {value: 2, name: "Large", code: "L"}
};

var currentSize = SIZE.MEDIUM;
if (currentSize == SIZE.MEDIUM) {
  // this alerts: "1: Medium"
  alert(currentSize.value + ": " + currentSize.name);
}

在JavaScript中,因为它是一种动态语言,所以以后甚至可以向集合中添加枚举值:

// Add EXTRALARGE size
SIZE.EXTRALARGE = {value: 3, name: "Extra Large", code: "XL"};

记住,枚举的字段(本例中的值、名称和代码)不需要用于身份检查,只是为了方便。此外,大小属性本身的名称不需要硬编码,也可以动态设置。因此,假设您只知道新枚举值的名称,您仍然可以毫无问题地添加它:

// Add 'Extra Large' size, only knowing it's name
var name = "Extra Large";
SIZE[name] = {value: -1, name: name, code: "?"};

当然,这意味着无法再进行某些假设(例如,该值表示大小的正确顺序)。

记住,在JavaScript中,对象就像一个映射或哈希表。一组名称值对。你可以在事先不了解它们的情况下循环浏览它们或以其他方式操纵它们。

实例

for (var sz in SIZE) {
  // sz will be the names of the objects in SIZE, so
  // 'SMALL', 'MEDIUM', 'LARGE', 'EXTRALARGE'
  var size = SIZE[sz]; // Get the object mapped to the name in sz
  for (var prop in size) {
    // Get all the properties of the size object, iterates over
    // 'value', 'name' and 'code'. You can inspect everything this way.        
  }
} 

顺便说一句,如果你对名称空间感兴趣,你可能想看看我为JavaScript提供的简单但强大的名称空间和依赖关系管理的解决方案:Packages JS