JS实现定时自动更换DIV或页面背景图片

        body {
            margin: 0;
            padding: 0;
        }
        #event-types {
            width: 300px;
            height: 180px;
        }

    window.onload = function () {
        var imgs = ["images/event0.jpg", "images/event1.jpg", "images/event2.jpg"];
        var i = 0;
        var head = document.getElementById("event-types");
        head.style.background = "url(images/event0.jpg)";
        function time() {
            i++;
            i = i % 3;
            head.style.background = "url(" + imgs[i] + ")";
        }
        setInterval(time, 6 * 1000);
    }