YouTube iFrame API“ setPlaybackQuality”无法正常工作。我想将视频质量更改为最低。但是我无法通过api对其进行更改。我使用了player.setPlaybackQuality（'small'）。无效。
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>
<body>
<button id="change_quality">Change Quality</button>
<div id="player"></div>
<script>
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
var player;
function onYouTubeIframeAPIReady() {
player = new YT.Player('player', {
height: '390',
width: '640',
videoId: '6LV3JdR5aZw',
events: {
'onReady': onPlayerReady,
'onStateChange': onPlayerStateChange
}
});
}
function onPlayerReady(event) {
}
function onPlayerStateChange(event) {
if (event.data == YT.PlayerState.PLAYING) {
$("#change_quality").click(function() {
event.target.playVideo();
var d=player.getPlaybackQuality()
console.log("before");
console.log(d);
player.setPlaybackQuality('small')
var v=player.getPlaybackQuality()
console.log("after");
console.log(v);
});
}
}
</script>
</body>
</html>
它在youtube演示中也不起作用 Demo