尝试制作数字字符串值的2D数组Javascript时出现错误

如何解决尝试制作数字字符串值的2D数组Javascript时出现错误

当我运行console.log时，我得到了所有正确的返回值，但是chrome表示初始化位置为var location = []时出错。我的同学和我都不知道为什么。

var location = [];
    
    /*This set of loops should create a 2D array called location and assign
    a string value to match it's position in the 2D array so that
    location[0][0] == "00" and location[2][1] == "21".
    */
    for(var i = 0; i < row; i++) {
      
      location[i] = [];
      
      for(var j = 0; j < col; j++) {
        
        location[i][j] = i.toString() + j.toString();
        console.log("i" + i +"\tj"+ j + " "+ location[i][j]);
      }
      
    }