vue3 + ts 從數據中拿到單個屬性，並存為字符串和數組

let cart_idsAll = "";
      //從對象中遍歷拿到指定屬性
      selectArrey.value.forEach(function (item) {
        //存為字符串
        (cart_idsAll as any) += (item as any).goods_id + ","; 
      });
      //將字符串的最后一","刪除，並根據","轉為數組
      (cart_idsAll as any) = cart_idsAll.substring(0,cart_idsAll.length-1).split(","); 
      if (cart_idsAll != "") {
        console.log("cart_idsAll", cart_idsAll);
      } else {
        ElMessage({
          message: "沒有選中任何訂單！",
          type: "warning",
        });