[LayaAir 1.0]个人笔记：失焦或静音状态下播放背景音乐无效的解决方案

SoundManager.playSound=function(url,loops,complete,soundClass,startTime){

		(loops===void 0)&& (loops=1);

		(startTime===void 0)&& (startTime=0);

		if(!url) return null;

		SoundManager._recoverWebAudio();

		url=URL.formatURL(url);

		if (url!=SoundManager._tMusic){

			if (Render.isConchApp){

				var ext=Utils.getFileExtension(url);

				if (ext !="wav" && ext !="ogg"){

					alert("The sound only supports wav or ogg format,for optimal performance reason,please refer to the official website document.");

					return null;

				}

			}

			if(!SoundManager._isActive || SoundManager._muted || SoundManager._soundMuted){

				return null;

			}

		};

		var tSound;

		if (!Browser.onMiniGame){

			tSound=Laya.loader.getRes(url);

		}

		if (!soundClass)soundClass=SoundManager._soundClass;

		if (!tSound){

			tSound=new soundClass();

			tSound.load(url);

			if (!Browser.onMiniGame){

				Loader.cacheRes(url,tSound);

			}

		};

		var channel;

		channel=tSound.play(startTime,loops);

		if (!channel)return null;

		if(url == SoundManager._tMusic){

			if(!SoundManager._isActive || SoundManager._muted || SoundManager._musicMuted){

				channel.pause();

				SoundManager._blurPaused=true;

			}

		}

		channel.url=url;

		channel.volume=(url==SoundManager._tMusic)? SoundManager.musicVolume :SoundManager.soundVolume;

		channel.completeHandler=complete;

		return channel;

	}