krpano 字符串拼接，传参。

<action name="onstartsounds301" scope="local" args="mpurl">
<!--        str = get(mpurl) + ".mp3";-->
        strUrl = '%CURRENTXML%/mp3/'+get(mpurl) + ".mp3";
<!--        createsound(jj)-->
<!--		playsound(bgsnd,('%CURRENTXML%/mp3/' + mpurl + '.mp3'));-->
		playsound(bgsnd,(strUrl));
    </action>

字符串拼接传参

错误方式

1.  playsound(bgsnd,'%CURRENTXML%/mp3/'+mpurl+ '.mp3');
2.  strUrl = '%CURRENTXML%/mp3/'+get(mpurl) + ".mp3";
playsound(bgsnd,strUrl );

正确方式

1.  playsound(bgsnd,('%CURRENTXML%/mp3/' + mpurl + '.mp3'));
2.  strUrl = '%CURRENTXML%/mp3/'+get(mpurl) + ".mp3";
playsound(bgsnd,(strUrl));

论坛地址 ：https://krpano.com/forum/wbb/index.php?thread/19820-syntax/\&postID=92670\&highlight=playsound#post92670