flash as3 - 如何获取数组中的下一个元素

Question

我有五个可能播放视频的视频，以及一系列名为activeVideos的活动视频。当一个视频完成播放时，我需要获取其索引，在activeVideos数组中找到它的位置，并获取数组中的下一个值。如果数组中没有更多值，我需要获取第一个值。基本上是这样的：

activeVideos = [0,1,3]
videos = [video1, video2, video3];

function nextVideo(e:Event){
    var curIndex = videos.indexOf(currentVideo);
    var next = activeVideos.find(curIndex).nextValue // pseudo-code - need to locate the position of the current video within the active array, select the next element, and call show video.
    showVideo(videos[next]);
}

我该怎么做？

Answer 1

activeVideos = [0,1,3]
videos = [video1, video2, null, video3];

function nextVideo(e:Event){
    var curIndex = videos.indexOf(currentVideo);
    var next = activeVideos[curIndex+1] || activeVideos[0];
    showVideo(videos[next]);
}

Answer 2

也许你可以在家里试试这个，我必须承认我的闪光灯可能会因为html5，css3 + js大肆宣传而有点生锈：）

nextIndex = -1;
nextIndex = ( (curIndex+1 == videos.length) ? 0 : curIndex+1 );
if (nextIndex > -1){
  var next = activeVideos[nextIndex];
  // ... do your stuff 
}

Answer 3

function nextVideo(e:Event){
    var curIndex = videos.indexOf(currentVideo) + 1;
    var nextVideo = curIndex >= videos.length ? videos[0] : videos[curIndex];
    showVideo(nextVideo);
}