播放视频1，2，正常，播放3，4时，都是播放2，不懂什么原因，帮帮忙呀
var self = this;
let videoNum = this.videoNum;
videoNum += 1;
if(videoNum>13) videoNum = 1;
this.videoNum = videoNum;
let url = ‘’;
if(videoNum===1) url = “video/1”;
else if(videoNum===2) url = “video/2”;
else if(videoNum===3) url = “video/3”;
else if(videoNum===4) url = “video/4”;
cc.loader.loadRes(url, cc.Asset, function (err, clip) {
self.videoPlayer.clip = clip;
self.videoPlayer.play();
});
cc.log('videonum', videoNum)