为什么该图像更改功能不起作用？

Question

Here is what I wrote:

var img_current = 0;
var image0 = new Image()
image0.src = "img/image_centrale/1_house_0.jpg"
var image1 = new Image()
image1.src = "img/image_centrale/1_house_1.jpg"
var image2 = new Image()
image2.src = "img/image_centrale/1_house_2.jpg"

function affich_centrale()
{
    if (house_bought == 1 && neighborhood_bought == 0)
    {
        img_current = 1;
        document.images.main.src = eval("image" + img_current + ".src").innerHTML = 'image_centrale';
    }
    else if (house_bought == 2 && neighborhood_bought == 0)
    {
        img_current = 2;
        document.images.main.src = eval("image" + img_current + ".src").innerHTML = 'image_centrale';
    }
    else{}

This will go on, but I think you get the gist. What's wrong with my code? The images won't change as my "house_bought" variable changes.

In my HTML part, I simply put this:

<div id="image_centrale">
    <img src="img/image_centrale/1_house_0.jpg"  name="main" />
</div>

Note: This is an upcoming full html/js game website.

Answer 1

Why do you use src and innerHTML at the same time? src is all you need, and there is no need for eval as well. Try this:

<div id="image_centrale">
    <img src="" name="main" />
</div>
<script type="text/javascript">
    var img_current = 0;
    var house_bought = 1;
    var neighborhood_bought = 0;
    var image0 = new Image()
    image0.src = "img/image_centrale/1_house_0.jpg"
    var image1 = new Image()
    image1.src = "img/image_centrale/1_house_1.jpg"
    var image2 = new Image()
    image2.src = "img/image_centrale/1_house_2.jpg"

    function affich_centrale() {
        if (house_bought == 1 && neighborhood_bought == 0) {
            img_current = 1;
            document.images.main.src = image0.src;
        }
        else if (house_bought == 2 && neighborhood_bought == 0) {
            img_current = 2;
            document.images.main.src = image1.src;
        }
        else { }
    }
    affich_centrale();
</script>

In this code example, I hard-coded the values for the variables just to make it a working example, so you will always see the first image. Change it to suite your needs.