关于轮播图的图片不动问题？

window.onload = function() {
var prev = $('#prev');
var next = $('#next');
var list = $('.piclist');
var buttons = document.getElementById('light-button').getElementsByTagName('li');
var index = 0;
var amd = false;
function showButton() {
for (var i = 0; i < buttons.length; i++) {
if (buttons[i].className === 'light') {
removeClass(buttons[i], 'light');
break;
}
}
addClass(buttons[index], 'light')
}
function animate(offset) {
amd = true;
var newLeft = parseInt(list.style.left) + offset;
var time = 300;
var interval = 10;
var speed = offset / (time / interval);
function go() {
if ((speed < 0 && parseInt(list.style.left) > newLeft)
|| (speed > 0 && parseInt(list.style.left) < newLeft)) {
list.style.left = parseInt(list.style.left) + speed + 'px';
}
else {
list.style.left = newLeft + 'px';
if (newLeft >= 0) {
list.style.left = -3600 + 'px';
}
else if (newLeft <= -4200) {
list.style.left = -600 + 'px';
}
amd = false;
}
}
go();
}
$.click(prev, function () {
if (!amd) {
animate(-600);
index--;
if (index === -1) {
index = 5;
}
showButton();
}
});
$.click(next, function () {
if (!amd) {
animate(600);
index++;
if (index === 6) {
index = 0;
}
showButton();
}
});
for (var i = 0; i < buttons.length; i++) {
$.click(buttons[i], function() {
if (!amd) {
var toIndex = parseInt(this.getAttribute('index'));
if (toIndex === index) {
return;
}
animate((toIndex - index) * (-600));
index = toIndex;
showButton();
}
})
};
}