JavaScript题，求解决（学者）

[qq_35807925]

[天际的海浪]

图片轮播

<img id="pic" />
<script type="text/javascript">
var arr = ["1.jpg","2.jpg","3.jpg"], ind = 0;
function piclb() {
	var img = document.getElementById("pic");
	img.src = arr[ind];
	ind = (ind+1)%arr.length;
}
piclb();
setInterval(piclb, 1000);

[天际的海浪]

背景变色

setInterval(function () {
	var r = ("0"+(Math.random()*256>>0).toString(16)).slice(-2);
	var g = ("0"+(Math.random()*256>>0).toString(16)).slice(-2);
	var b = ("0"+(Math.random()*256>>0).toString(16)).slice(-2);
	document.body.style.backgroundColor = "#"+r+g+b;
}, 1000);