var image = new Array(4); //定义image为图片数量的数组
image [0] = './img/bg5.jpg'; //背景图象的路径
image [1] = './img/bg6.jpg'; //背景图象的路径
image [2] = './img/bg7.jpg'; //背景图象的路径
image [3] = './img/bg8.jpg'; //背景图象的路径
window.onload=function () {
timeA=setInterval(aa,2000);
};
function aa(){
number = Math.floor(Math.random() * image.length);
$(".content_1").css("background-image","url("+image[number]+")");
}
