HTML implements background image replacement

<p class="p"> 
       <p class="p2"><img src="../img/hu.jpg"  alt=""  id="picture"></p>
       </p>
</p>

var curIndex = 0;
var timeInterval = 3000; //切换时间 3秒  可以修改
var arr = new Array();
arr[0] = "../img/hu.jpg"; //这里的是图片存放的相对路径
arr[1] = "../img/bb.jpg";
arr[2] = "../img/cc.jpg";
setInterval(changeImg, timeInterval);

function changeImg() {
var obj = document.getElementById("picture");
if(curIndex == arr.length - 1) {
curIndex = 0;
} else {
curIndex += 1;
}
obj.src = arr[curIndex];
}