从二维数组中删除最低等级，并将其余的放入新的二维数组中

function removeLowestLevel(arr) {
  // 找到最低等级
  let lowestLevel = Infinity;
  for (let i = 0; i < arr.length; i++) {
    for (let j = 0; j < arr[i].length; j++) {
      if (arr[i][j] < lowestLevel) {
        lowestLevel = arr[i][j];
      }
    }
  }

  // 创建新的二维数组
  let newArr = [];
  for (let i = 0; i < arr.length; i++) {
    let row = [];
    for (let j = 0; j < arr[i].length; j++) {
      if (arr[i][j] > lowestLevel) {
        row.push(arr[i][j]);
      }
    }
    if (row.length > 0) {
      newArr.push(row);
    }
  }

  return newArr;
}

// 示例用法
let arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
let result = removeLowestLevel(arr);
console.log(result);

[[2, 3], [5, 6], [8, 9]]