How to use the big-integer/BigInteger.min.js.add function in big-integer

arr[index].onmessage = function(event) {
              console.log(
                "主线程从副线程" + (index + 1) + "接收" + "event.data\n",
                event.data
              );
              // console.log(
              //   "第一个参数",
              //   event.data[0],
              //   "\n第二个参数",
              //   event.data[1]
              // );
              var p1 = new bigInt(event.data[0]);
              p = bigInt.add(p, p1);
              x = Math.max(x, parseInt(event.data[1]));
              finishflag[index] = 1;
              //   threadfinish(btnele);
              //   currentValue.terminate()
              rs(event.data);
            };
            arr[index].onerror = e => {