Question

仿阿里巴巴字母轮换的JS出现错误document.getElementById(...)' 为空或不是对象

<script type="text/JavaScript">
(function() {
var timer;
var popIndex = -1;
var popCtrl = document.getElementById('popCtrl').getElementsByTagName('a');

for (var i = 1; i < popCtrl.length; i++) {
popCtrl[i].onmouseover = function(i) {
return function() {
timer = window.setTimeout(function ()
{
this.className = 'titleon';
if (popIndex != -1 && popIndex != i) {
popCtrl[popIndex].className = 'title';
document.getElementById('pop' + popIndex).style.display = 'none';
}
showPop(i);
popIndex = i;
}, 250);
}
} (i)
popCtrl[i].onmouseout = function(i) {
return function(evt) {
clearTimeout(timer);
var popWrap = document.getElementById('pop' + i);
if (/Firefox/.test(window.navigator.userAgent)) {

Answer 1

代码不完整啊
或者试试这个图片切换
有12345数字一起切换
鼠标点一下数字会变换到另一张图片，不点就会自动换
里面有教程和源码