Question

div背景图片自动切换问题

代码如下：
<script language="javascript" type="text/javascript">
var images= ["images/2.png", "images/3.png", "images/4.png", "images/5.png"];
var index = 0;
function switch_background(){
if(index ==images_id.length-1)
{
index = 0;
}else{
index++;
}
document.getElementById("div1").style.backgroundImage=url(images[index]);
}
window.onload = function()
{
setInterval(switch_background, 3000);
} </script>

可是添加到html中后起不了作用，谁能告诉我这是怎么回事啊

Answer 1

1楼是正确的，还有个问题，数组名images_id

注意红框地方的问题

Answer 2

document.getElementById("div1").style.backgroundImage="url("+images[index]+")";