用Javascript创建一个类似.net的字典对象

Creating a .net like dictionary object in Javascript

本文关键字：net 对象 字典 一个 创建 Javascript      更新时间：2023-09-26

我想用JavaScript创建一个对象，它将在键、值对中存储值，我应该能够传递一些键，并且应该能够取回它的值。在.NET世界中，我们可以使用dictionary类来实现这种类型。在JavaScript世界里，我们有什么选择吗？我使用的是ExtJs 4.1，所以如果你知道ExtJs中的任何选项，即使是这样也可以。

我尝试过类似的方法，但无法通过键获取值

var Widget = function(k, v) {
    this.key = k;
    this.value = v;
};
var widgets = [
    new Widget(35, 312),
    new Widget(52, 32)
];

只需使用标准的javascript对象：

var dictionary = {};//create new object
dictionary["key1"] = value1;//set key1
var key1 = dictionary["key1"];//get key1

注意：您还可以获取/设置使用点符号（即dictionary.key1）创建的任何"密钥"

如果你想要它的特定功能，你可以更进一步…

function Dictionary(){
   var dictionary = {};
   this.setData = function(key, val) { dictionary[key] = val; }
   this.getData = function(key) { return dictionary[key]; }
}
var dictionary = new Dictionary();
dictionary.setData("key1", "value1");
var key1 = dictionary.getData("key1");

这门课取自Marijn Havereke的书《Eloquent JavaScript 》

小提琴

function Dictionary(values) {
    this.values = values || {};
    var forEachIn = function (object, action) {
      for (var property in object) {
        if (Object.prototype.hasOwnProperty.call(object, property))
          action(property, object[property]);
      }
    };
    Dictionary.prototype.containsKey = function(key) {
      return Object.prototype.hasOwnProperty.call(this.values, key) &&
        Object.prototype.propertyIsEnumerable.call(this.values, key);
    };
    Dictionary.prototype.forEach = function(action) {
      forEachIn(this.values, action);
    };
    Dictionary.prototype.lookup = function(key) {
      return this.values[key];
    };
    Dictionary.prototype.add = function(key, value) {
      this.values[key] = value;
    };
};
var numberDic = new Dictionary({One: 1,Two: 2, Three: 3});
//-- does key exist
console.log(numberDic.containsKey("One"));
console.log(numberDic.containsKey("One"));
console.log(numberDic.containsKey("Four"));
//-- loop through each item in the dic
numberDic.forEach(function(key, value) {
  console.log(key, "is", value);
});
//-- works with complex objects
//------------------------------------------
var complexObjectDic = new Dictionary({
    Microsoft: {
        Something: "Real Interesting",
        About: "Microsoft",
        Will: "Go",
        Here: ".",
        ProductPrices: {
            WindowsPhone: 55.88,
            Windows :{
                WinXp : 180.00,
                Win7 : 200.00,
                Win8 : 150.00
            }
        }
    },
    Apple: {
        Did: "you",
        Hear: "the",
        New: "iphone",
        Will: "be coming out soon",
    }});
//-- does key exist
console.log(complexObjectDic.containsKey("Microsoft"));
console.log(complexObjectDic.containsKey("Apple"));
console.log(complexObjectDic.containsKey("Facebook"));
//-- search the dic by key
console.log(complexObjectDic.lookup("Microsoft"));
console.log(complexObjectDic.lookup("Apple"));
//-- add item to dic
complexObjectDic.add("Instagram", {
    This: "is",
    Another: "object",
    That: "I willl be Adding"
});
//-- loop through each item in the dic
complexObjectDic.forEach(function(key, value) {
    console.log(key, value);
});

var widget={};
var key='k';
widget[key]='v';
alert(widget.k);//gives you v
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