 或有更多块
			for(var i=12,iL=wavView.length-8;i<iL;){
				if(wavView[i]==100&&wavView[i+1]==97&&wavView[i+2]==116&&wavView[i+3]==97){//eq(i,"data")
					dataPos=i+8;break;
				}
				i+=4;
				i+=4+wavView[i]+(wavView[i+1]<<8)+(wavView[i+2]<<16)+(wavView[i+3]<<24);
			}
			console.log("wav info",sampleRate,bitRate,numCh,dataPos);
			
			if(dataPos){
				return {
					u8arr:new Uint8Array(wavView.buffer.slice(dataPos))
					,info:{bitRate:bitRate,sampleRate:sampleRate,numChannels:numCh}
	