выводит undefined как исправить ?
 

у меня такой вопрос
я недавно начал изучать javascript /html/css
при нажатии клавиши
в консоли выводит undefined

function getRandomInt(min, max)
{ return Math.floor(Math.random() * (max - min + 1)) + min;   }

function Button_Mine(MinesCount,Mine)
{
    this.MinesCount = MinesCount;
    this.Mine = Mine;
    this.link = 0;
console.log(this.Mine +" "+ this.MinesCount+" "+this.link);


}
Button_Mine.prototype.click = function()
    {
   
        if(this.Mine == 1)
        {
            alert("вы проиграли");
        }
        console.log(this.Mine);
    console.log(this.MinesCount+" "+this.Mine);
}
function map(cols,lines,CountOfMines)
{
this.CountOfMines = CountOfMines;
this.Cols  = cols;
this.Lines = lines; 

this.Element = Array(this.Cols);
for (var i  =0;i<this.Cols;i++)
{this.Element[i] =Array(this.Lines);
 for (var j = 0;j<this.Lines;j++)
    {
    this.Element[i][j] =new Button_Mine(0,0);
    }
    }
    console.log(this.Cols);
}
map.prototype.Create = function()
{
for (var i = 0;i<this.Cols;i++){for (var j =0;j<this.Lines;j++){
  document.write("<button id=\"b"+i+j+"\">"+"</button>");
this.Element[i][j].link = document.getElementById("b"+i+j);
    this.Element[i][j].link.addEventListener("click",this.Element[i][j].click,"false");
  

}}}
map.prototype.SetMines = function()
{
var i = 0;
      var int1 , int2;
    console.log("CountOfMines = " + this.CountOfMines);
    while(i <=this.CountOfMines)
    {
        
       int1 = getRandomInt(0,(this.Cols)-1);
       int2 = getRandomInt(0,(this.Lines)-1);
  if(this.Element[int1][int2].Mine==1)
  {
      int1 = getRandomInt(0,(this.Cols)-1);
      int2 = getRandomInt(0,(this.Lines)-1);
  }
        console.log(this.Cols+" "+int1+" "+int2);
    console.log(this.Lines);
        this.Element[int1][int2].Mine = 1;
        this.Element[int1][int2].link.style.backgroundColor="red";
   i++;
    }



}
map.prototype.CheckCountOfMines = function()
{
    for (var i = 0;i<this.Cols;i++)
    {
    for (var j = 0;j<this.Lines;j++)
    {
    
        if((i>0)       && (j>0)                && this.Element[i-1][j-1].Mine == true){this.Element[i][j].CountOfMines++;}
        if((j>0)                               && this.Element[ i ][j-1].Mine == true){this.Element[i][j].CountOfMines++;}
        if((i<this.Cols-1)&& (j>0)             && this.Element[i+1][j-1].Mine == true){this.Element[i][j].CountOfMines++;}
        if((i>0)                               && this.Element[i-1][ j ].Mine == true){this.Element[i][j].CountOfMines++;}
        if((i<this.Cols-1)                     && this.Element[i+1][ j ].Mine == true){this.Element[i][j].CountOfMines++;}
        if((i>0)       && (j<this.Lines-1)     && this.Element[i-1][j+1].Mine == true){this.Element[i][j].CountOfMines++;}
        if((j<this.Lines-1)                    && this.Element[ i ][j+1].Mine == true){this.Element[i][j].CountOfMines++;}
        if((i<this.Cols-1)&& (j<this.Lines-1)  && this.Element[i+1][j+1].Mine == true){this.Element[i][j].CountOfMines++;}
       }
}
        console.log(this.Cols);
}


function Button_Mine(MinesCount,Mine)
{
    this.MinesCount = MinesCount;
    this.Mine = Mine;
    this.link = 0;
    
}
Button_Mine.prototype.click = function()
    {
   
        if(this.Mine == 1)
        {
            alert("вы проиграли");
        }
        console.log(this.Mine);
    console.log(this.MinesCount+" "+this.Mine);
}
    
var Map = new map(10,10,10);
Map.Create();
Map.SetMines();
Map.CheckCountOfMines();

html
css

я думаю это из-за того что я память неправильно определяю
где то здесь

this.Element[i][j] = new Button_Mine(0,0);