轮播图的定时器

window.onload=function () {
    var alogo =document.getElementById("logo")
    var aa = ["./img/cd3e871466f03e864f08e12cd372bcc9.jpeg",
        "./img/b27b4f1f0b212f503cbb24011dc8f7e6.jpeg",
        "./img/0bda20a27b83f7e25665b48736f3264b.jpeg",
        "./img/88442c2c2f87a4737ddc2305113b66ab.jpeg",
        "./img/40a457585714d439acca2085a1e32a07.jpeg",
        "./img/8ffc1b07c66ecaf530e3bc613551d1f7.jpeg",
        "./img/cd3e871466f03e864f08e12cd372bcc9.jpeg"
    ];
//定义bb为id 为“lb1”的div
    var bb = document.getElementById('abpicimg');
    var i = 0;
    setInterval(function(){
        //运行一次i+1
        i++;
        //如果i等于aa数组的长度时让i=0
        if(i==aa.length){
            i=0;
        }
        //让bb等于aa【i】
        bb.src=aa[i];
        //两秒钟轮播一次
    },2000);