异步复制文件

var sourceFile: File;
var destination: File;
//移动文件
function addData() {
	nowNum++;
	removeHdl();
	if (nowNum >= totalNum) {
		LoadOver();
	} else {
		sourceFile = data_arr[nowNum];
		destination = new File(targetFileUrl);
		sourceFile.copyToAsync(destination, true);
		sourceFile.addEventListener(Event.COMPLETE, addData);
		sourceFile.addEventListener(IOErrorEvent.IO_ERROR, moveDataErr);
	}

}

private function moveDataErr(e1 = null, e2 = null) {
	removeHdl();
	trace("复制失败：" + data_arr[nowNum].nativePath);
	addData();
}
function removeHdl(e = null) {
	if (sourceFile) {
		sourceFile.removeEventListener(Event.COMPLETE, addData);
		sourceFile.removeEventListener(Event.COMPLETE, addData);
		sourceFile = null;
	}

}

function LoadOver(){
	trace("全部完成")
}