DOM对象可以是Javascript数组中的索引/键吗？

Question

Would like to maintain a map/hash of DOM objects. Can they serve as key objects? If not, what are the alternatives, please? If there are better ways - kindly enlist them as well.

Answer 1

You can put anything as the key, but before actual use it is always converted to string, and that string is used as a key. So, if you look at what domObject.toString() produces, you see it is not a good candidate. If all of your dom objects have an id, you could use that id. If not, and you still desperately need a key based on DOM object, you probably could do with using, for example, _counter attribute with automatic counter in background putting new unique value in a DOM object if _counter is not yet present.

Answer 2

window already maintains all DOM objects as properties. Instead of putting your own keys for each 'DOM object' try to use window or document object and methods that uses index based on the layout of DOM tree.

Answer 3

最简单的方法是在元素上设置数据属性。

Answer 4

不，但您可以在包含数字的DOM元素上设置一个属性，您可以将其作为数字索引数组中的索引。

Answer 5

No, because object keys are strings.

You'd have to "serialise" your objects by id or something, then perform a lookup later. Probably not worth it, depending on what your actual goal is here.

Answer 6

Not exact. But I think you want something like below. You can do with jquery ,

The .serializeArray() method creates a JavaScript array of objects, ready to be encoded as a JSON string. It operates on a jQuery object representing a set of form elements. The form elements can be of several types

Refer below link : http://api.jquery.com/serializeArray/