我一直在尝试修改以下代码片段，循环显示2张图片：
<script type="text/javascript">
var swap = 0;
var homeimg = new Array(1);
homeimg[0] = "http://media.com/i/ct/11-hp-main?w=2350&h=1056&qlt=50";
homeimg[1] = "http://media.com/i/ct/11-hp-main-mens?w=2350&h=1056&qlt=50";
setInterval(function() {
swap = (swap ? 0 : 1);
$(".homepage-mainimage img").attr("src",homeimg[swap]);
},4000);
</script>
请问为什么在我尝试扩展此脚本以容纳8个图像后，为什么它不起作用？我很难理解为什么脚本已经坏了。
<script type="text/javascript">
var swap = 0;
var homeimg = new Array(7);
homeimg[0] = "http://media.com/i/ct/15-hp-main-1?w=2350&h=1056&qlt=50";
homeimg[1] = "http://media.com/i/ct/15-hp-main-2?w=2350&h=1056&qlt=50";
homeimg[2] = "http://media.com/i/ct/15-hp-main-3?w=2350&h=1056&qlt=50";
homeimg[3] = "http://media.com/i/ct/15-hp-main-4?w=2350&h=1056&qlt=50";
homeimg[4] = "http://media.com/i/ct/15-hp-main-5?w=2350&h=1056&qlt=50";
homeimg[5] = "http://media.com/i/ct/15-hp-main-6?w=2350&h=1056&qlt=50";
homeimg[6] = "http://media.com/i/ct/15-hp-main-7?w=2350&h=1056&qlt=50";
homeimg[7] = "http://media.com/i/ct/15-hp-main-8?w=2350&h=1056&qlt=50";
setInterval(function() {
swap = (swap ? 0 : 8);
$(".homepage-mainimage img").attr("src",homeimg[swap]);
},1500);
</script>