javascript 我可以用 Map<String, Object> 之类的东西在 jquery 中存储数据？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/3267868/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Something like a Map<String, Object> I can use to store data in jquery?
提问by user246114
I have some JSON objects I'd like to store in a map for the lifetime of my app. For example, my app shows a listing of Farms. When a user clicks one of the Farm links, I download a Farm representation as JSON:
我有一些 JSON 对象，我想在我的应用程序的整个生命周期中将它们存储在地图中。例如，我的应用程序显示了一个农场列表。当用户单击 Farm 链接之一时，我将 Farm 表示下载为 JSON：
Farm 1
Farm 2
...
Farm N
every time the user clicks one of those links, I download the entire Farm object. Instead, I'd like to somehow make a global map of Farms, keyed by their ID. Then when the user clicks one of the above links, I can see if it's already in my map cache and just skip going to the server.
每次用户单击这些链接之一时，我都会下载整个 Farm 对象。相反，我想以某种方式制作一个农场的全球地图，以他们的 ID 为键。然后当用户单击上述链接之一时，我可以查看它是否已经在我的地图缓存中，然后跳过去服务器。
Is there some general map type like this that I could use in jquery?
是否有一些像这样的通用地图类型可以在 jquery 中使用？
Thanks
谢谢
回答by Felix Kling
What about a JavaScript object?
JavaScript 对象呢？
var map = {};
map["ID1"] = Farm1;
map["ID2"] = Farm2;
...
Basically you only have two data structure in JavaScript: Arrays and objects.
JavaScript 中基本上只有两种数据结构：数组和对象。
And fortunately objects are so powerful, that you can use them as maps / dictionaries / hash table / associative arrays / however you want to call it.
幸运的是，对象是如此强大，您可以将它们用作地图/字典/哈希表/关联数组/无论您想怎么称呼它。
You can easily test if an ID is already contained by:
您可以轻松测试 ID 是否已包含在：
if(map["ID3"]) // which will return undefined and hence evaluate to false
回答by spender
The object type is the closest you'll get to a map/dictionary.
对象类型是最接近地图/字典的类型。
var map={};
map.farm1id=new Farm(); //etc
回答by R. Hill
farmMap = {};
farmMap['Farm1'] = Farm1;
...
