JS实现的手机端精简幻灯片效果

var curIndex = 0;
var timeInterval = 4000;
var arr = new Array();
arr[0] = "fukeb.jpg";
arr[1] = "baopi.jpg";
arr[2] = "renliub.jpg";
setInterval(changeImg, timeInterval);
function changeImg() {
  var obj = document.getElementById("showpic");
  if (curIndex == arr.length - 1) {
    curIndex = 0;
  } else {
    curIndex += 1;
  }
  obj.src = "/templets/v1/images/" + arr[curIndex];
}
document.writeln("<div style=\"width:300px;margin:10px auto 0 auto;overflow:hidden;\"><a href=\"/zixun/?f=top_ad\" target=\"_blank\"><img src=\"/templets/v1/images/fukeb.jpg\" id=\"showpic\" /></a></div>");