let arr3 = 123123213433243;遍历数组 fore

To traverse the given array arr3, you can use a nested loop. Here's an example implementation in JavaScript:

let arr3 = [[1, 2, 3], [12, 3213, 43], [32, 43]];

for (let i = 0; i < arr3.length; i++) {
  for (let j = 0; j < arr3[i].length; j++) {
    console.log(arr3[i][j]);
  }
}

This code will iterate over each element in the 2D array and print its value.