I'm learning JavaScript with the help of a number of books. In one of them I came up with a script that displays a couple of flags and then you click on them to randomly change them:
var myImages = new Array("usa.gif","canada.gif","jamaica.gif","mexico.gif");
function changeImg(that) {
var newImgNumber = Math.round(Math.random() * 3);
while (that.src.indexOf(myImages[newImgNumber]) != -1)
{
newImgNumber = Math.round(Math.random() * 3);
}
that.src = myImages[newImgNumber];
return false;
}
It has a while loop to make sure that when you click on a flag you don't end up with the same one. The rest of the code in HTML looks like this:
<body>
<img name="img0" src="usa.gif" border="0" onclick="return changeImg(this)" />
<img name="img1" src="mexico.gif" border="0" onclick="return changeImg(this)" />
</body>
Now, my question is, if I use an IF statement instead of a while loop, apparently the code works the same. In this particular example why is the while loop used instead of IF? Thanks.
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