vue 判断数组有值没有将显示别的

<span><div>主演:{{actorsList(item.actors)}}</div></span>



methods: {
    actorsList (list) {
         let arr = [];
            if (list) {
                  arr = list.map(itemx => {
                    return itemx.name;
                  });
                }else{
                    return "暂无主演"
                }
                console.log(arr)
                return arr.join(' ');
            }}