如何使用Youtube的HTML5 iframe API设置wmode = opaque？

我通过使用JavaScript API将YouTube的实验性HTML5 iframe功能嵌入到网站中：

YouTube Player API Reference for <ifram> Embeds

我知道这带来的z-index问题，并且涉及在iframe url中添加wmode = opaque(或wmode = transparent)的修补程序：

Fixed. My Youtube iframe z-index is ignored and is above a fixed div

当使用javascript API时，如何将wmode设置为opaque？

function onYouTubePlayerAPIReady() {
    var player;
    player = new YT.Player('player',{
        width: 1280,height: 720,videoId: 'u1zgFlCw8Aw',// if I try adding wmode: opaque here,it breaks
        playerVars: {
            controls: 0,showinfo: 0,modestbranding: 1
            // if I try adding wmode: opaque as a playerVar here,it breaks
        },events: {
            'onReady': onPlayerReady,'onPlayBACkQualityChange': onPlayerPlayBACkQualityChange
        }
    });
 }

有任何想法吗？

function onYouTubePlayerAPIReady() {
    var player;
    player = new YT.Player('player',playerVars: {
            controls: 0,modestbranding: 1,wmode: "opaque"
        },'onPlayBACkQualityChange': onPlayerPlayBACkQualityChange
        }
    });
 }