在下面的幻灯片代码中,有一个功能可以按下“上一个”和“下一个”链接。“下一个”工作正常,如果您继续按下它,它会循环播放所有幻灯片。
出于某种原因,“前一个”有点混乱 - 它会返回一两张幻灯片,但随后就会变成空白!
能否请你帮忙?谢谢!
<script type="text/javascript">
start_slideshow(1, 3, 3000);
var currentSlide = 1;
function start_slideshow(start_frame, end_frame, delay) {
id = setTimeout(switch_slides(start_frame,start_frame,end_frame, delay), delay);
}
function switch_slides(frame, start_frame, end_frame, delay) {
return (function() {
Effect.Fade('slide' + frame, { duration: 1.0 });
if (frame == end_frame) {
frame = start_frame;
currentSlide = frame;
} else {
frame = frame + 1;
currentSlide = frame;
}
Effect.Appear('slide' + frame, { duration: 1.0 });
if (delay == 1000) {
delay = 3000;
}
id = setTimeout(switch_slides(frame, start_frame, end_frame, delay), delay);
})
}
function stop_slideshow() {
clearTimeout(id);
}
function next_slide() {
clearTimeout(id);
Effect.Fade('slide' + currentSlide, { duration: 1.0 });
if (currentSlide == 4) {
currentSlide = 0;
}
currentSlide = currentSlide + 1;
Effect.Appear('slide' + currentSlide, { duration: 1.0 });
id = setTimeout(switch_slides(currentSlide, currentSlide, currentSlide, delay), delay);
}
function previous_slide() {
clearTimeout(id);
if (currentSlide == 0) {
currentSlide = 1;
} else {
Effect.Fade('slide' + currentSlide, { duration: 1.0 });
currentSlide = currentSlide - 1;
Effect.Appear('slide' + currentSlide, { duration: 1.0 });
id = setTimeout(switch_slides(currentSlide, currentSlide, currentSlide, delay), delay);
}
}
</script>