Variable as the property name in a JavaScript obje

问题:

This question already has an answer here:

• How to use a variable for a key in a JavaScript object literal? 9 answers

Possible Duplicate:
How do I add a property to a Javascript Object using a variable as the name?
Use variable for property name in JavaScript literal?

Is it possible to add a variable as the property name of an object in JavaScript, like this:

var myVar = \"name\";
var myObject = {
    {myVar}: \"value\"
};

回答1:

You can use the [] syntax to use an expression as the property name (compared to the .prop and prop: value syntaxes where they are always treated as strings):

var myObject = {};
var myVar = \"name\";
myObject[myVar] = \"value\";

There is no way to use that inside an object literal, though. You have to create the object first and then assign each property separately.

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Edit

With ES6, this is now possible using a ComputedPropertyName, which manifests in the form of the following syntax:

var myVar = \"name\";
var myObject = {
    [myVar]: \"value\"
};

回答2:

Like this?

var myVar = \"name\";
var myObject = {};

myObject[myVar] = \"value\";

回答3:

Yes, but not directly.

var myVar = \"name\";
var object = {};
object[myVar] = \"value\";