使用Javascript数组，对象和RaphaelJS的奇怪行为

Question

I have a situation of defining an object with an array in it. For some reason Chrome adds artifacts to that object before I try to use it.

My Object:

var colorPalettes = {
            single_A7DBD8: {
                amounts: [100],
                colors: ['#A7DBD8']
            }, 
            single_C02942: {
                amounts: [100],
                colors: ['#C02942']
            }
}

When I run the code, the console shows the following content for var colorPalettes :

amounts: Array[1]
   0: Object  //<-- added by Chrome, 'value' should come directly in the array
     order: 0
     value: 100
     valueOf: function (){return this.value}
     __proto__: Object
     length: 1
     __proto__: Array[0]
colors: Array[1]
   0: "#A7DBD8"
     length: 1
    __proto__: Array[0]
    __proto__: Object

The questions are:

1. Why does amounts have an Object inside the array? - I didn't define it.
2. If so - why isn't colors demonstrating the same behavior?
3. Why is this behavior not demonstrated in my code when I run it through jsfiddle?

What did I try:

1. In my code colorPalettes is set as window.something.colorPalettes . I turned it into a local variable - no success.
2. I tried swapping the order of amounts and colors (I know, I was desperate...) - so the behavior also swapped, now colors had the extra Object .
3. I put my code into http://jsfiddle.net/2JfyX/4/ but the behavior was normal - no extra Object inside colorPalettes .

Edit 1:

I also tried to put a string inside amounts instead of its current int .

Edit 2:
Tried to simulate adding a jQuery click event as in my code, was not able to reproduce http://jsfiddle.net/2JfyX/19/

Edit 3:
I believe I have found the culprit. It is g.Raphael. For some reason (didn't delve into their code yet), it makes changes to the object I pass to it

You can see that I directly pass colorPalettes to r.piechart and in the 6th loop it changes my array to contain an object. Not nice :-O

I will clone the arrays from now on and hope for the best...

function renderPalettes(colorPalettes, radius) {

            var gap = radius + 20;

            for (var palette in colorPalettes) {

                var paletteObj = r.piechart(gap, 43, radius, colorPalettes[palette].amounts, {
                    colors: colorPalettes[palette].colors,
                    stroke: "#cdcdcd",
                    strokewidth: '0.3'
                });

                for (var i = 0; i < paletteObj.series.items.length; i++) {

                    paletteObj.series.items[i].node.setAttribute('class', palette + ' sliderPalette');



                }

                gap = gap + radius * 2 + 24;
            }
        }

Any idea? Thanks, D.

Answer 1

I just ran this code in FireFox Firebug. I did console.log() on the object and the following result was displayed.

This pretty much explains the whole situation. The object has two nested objects inside it single_A7DBD8 and single_C02942 Both these objects contain two arrays. "amounts" and "colors".

As you can see the + sign with each array. It shows that these contain elements and we can expand these to see elements at each index of the array.

So if you want to access the first element of amounts array in first object execute this code:

console.log(colorPalettes.single_A7DBD8.amounts[0]); 

Remember colorPalettes contains two objects