Efficient syntax for populating a javascript associative array

问题

I have an autocomplete text box that users can type an item code into and need to find out what the id number of that item code is in javascript.

An associative array is the way I would imagine it should be done, but the following seems a little long winded and I'm hoping someone has a better way to do it or shorthand of what I have below:

var itemIds = new Array();
itemIds["item1"] = 15;
itemIds["item2"] = 40;
itemIds["item3"] = 72;
...

function getItemId(code){
    return itemIds[code];
}

回答1:

What you're doing isn't an array - it's an object (objects in JavaScript are the equivalent-ish of associative arrays in PHP).

You can use JavaScript object literal syntax:

var itemIds = {
    item1: 15,
    item2: 40,
    item3: 72
};

JavaScript object members can be accessed via dot notation or array subscript, like so:

itemIds.item1;
itemIds['item1'];

You'll need to use the second option if you've got the member name as a string.

回答2:

Try using Object Literal notation to specify your lookup like this:

var itemIds = {
    "item1" : 15,
    "item2" : 40
    ...
};

Access should still work like this:

var item1Value = itemIds["item1"];

来源：https://stackoverflow.com/questions/3831181/efficient-syntax-for-populating-a-javascript-associative-array