?</style>
?? <script>
??? window.onload = function(){
?????? var container = document.getElementById('container');
??? var listImg = document.getElementById('listImg');
??? var buttons = document.getElementById('buttons');
??? var next = document.getElementById('next');
??? var prev = document.getElementById('prev');
??? var index = 1;
??? function animate(offset){
???????? var newlist = parseInt(listImg.style.left)+offset;
????? listImg.style.left = newlist + 'px';
???? if(newlist > -700){
???????? listImg.style.left = -3500 + 'px';
???? }
???? if(newlist < -3500){
???????? listImg.style.left = -700 + 'px';
???? }
??? }
??? function showButtons(){
??????? buttons[index-1].className = 'on';???? 在這用className瀏覽器報??‘Uncaught TypeError: Cannot set property 'className' of undefined?’ 這個錯呢
??? }

??? next.onclick = function(){
??????? showButtons();
??????? animate(-700);
??? }
??? prev.onclick = function(){
??????? animate(700);
??? }
??? }
???
?? </script>