JQ JS 切换背景图

<script type="text/javascript">
    var currentIndex = 0;
    function changeBg() {
        //定义要切换的背景图片，双引号里面"1.jpg","2.jpg","3.jpg","4.jpg"，可以放任意多个用,隔开
        var bgImgs = ["1.jpg","2.jpg","3.jpg","4.jpg"];
        if (currentIndex >= bgImgs.length)
            currentIndex = 0;
        $("#divbanner").css("background-image", "url(" + bgImgs[currentIndex] + ")");
        currentIndex += 1;
    }
    setInterval("changeBg()", 2000); //设定定时切换，单位为毫秒这里是3000 毫秒
</script>
<div id="divbanner" class="banner" style="background-image:url(<%= strhomeAdvertisement_1%>);">
</div>