在Javascript中创建一个类似.net的字典对象
在Javascript中创建一个类似.net的字典对象
提问于 2013-07-22 20:36:41
我想在JavaScript中创建一个对象，它将值存储在键，值对中，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类来实现这一类。在JavaScript的世界里我们有什么选择吗？我使用的是ExtJs4.1，所以如果你知道ExtJs中的任何选项，那也可以。
我已经尝试过这样的方法，但我无法通过键获取值。
var Widget = function(k, v) {
this.key = k;
this.value = v;
};
var widgets = [
new Widget(35, 312),
new Widget(52, 32)
];回答 3
Stack Overflow用户
回答已采纳
发布于 2013-07-22 20:40:08
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:您也可以使用点符号(即dictionary.key1)获取/设置您创建的任何“关键帧”
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");Stack Overflow用户
发布于 2014-08-02 08:40:59
这个取自Marijn Havereke's book Eloquent JavaScript的类怎么样？
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);
});Stack Overflow用户
发布于 2013-07-22 20:50:06
var widget={};
var key='k';
widget[key]='v';
alert(widget.k);//gives you v页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/17787754
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