为什么我们在JavaScript return语句中使用functionName：函数

Question

I am completely new to javascript. I saw the below snippet in a tutorial. But i am not sure why do we use funtionName: function in return statement.

For example, getID:function() and setID: function() in the below code. Can anybody explain.

function celebrityID () {
    var celebrityID = 999;

    return {
        getID: function ()  {

          return celebrityID;
        },
        setID: function (theNewID)  {

            celebrityID = theNewID;
        }
    }

}

Answer 1

in your celebrityID () function you are returning an object, which has two properties those properties are function.

you can call

var myVar = new celebrityID();

myVar.getID(); // myVar = 999

this like object creation from a class

Answer 2

So they can use it as

var cid = celebrityID();
var celbId = cid.getID();

If you do not have the return statement the function getID() will not be useful and also celbId becomes undefined.

If you closely observe, there is no return statement for setter.