js，视频关于video.js 动态添加src以及动态添加字幕

videoPlayer.ready(function() {
videoPlayer.src([
{
type: "video/mp4",
src: resurl
},
{
type: "video/webm",
src: resurl
},
{
type: "video/ogg",
src: resurl
}
]);
loadZmFile();
});
function loadZmFile(){
var tracks = videoPlayer.remoteTextTracks()
if(tracks != null && tracks.tracks_ != null && tracks.tracks_.length > 0 ){
do
{
videoPlayer.removeRemoteTextTrack(tracks.tracks_[0]);
}
while (tracks.tracks_.length > 0);
};
if(resSubtitle != null && resSubtitle!="" && resSubtitle.substring(resSubtitle.length-3) == "vtt") {
var subtitle = resSubtitle.split(";");
var isDefault = true;
var langue = {};
langue['ch'] = "简体中文";
langue['zh'] = "简体中文";
langue['en'] = "英文";
$.each(subtitle, function(i, item) {
if(i == 0) {
isDefault = true;
} else {
isDefault = false
};
var tt = {
tech: videoPlayer.tech_,
kind: "subtitles",
label: langue[item.slice(-6, -4)],
srclang: item.slice(-6, -4),
src: baseUrl + "/files/" + item,
default: isDefault
};
videoPlayer.addRemoteTextTrack(tt,true);
})
}
}