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<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
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td {
    border: 1px solid green;
    width: 28px;
    height: 28px;
}
#field {
    border-spacing: 0;
    border-collapse: collapse;
}
 
// noprotect
var dom = {};
dom.rand = function(min, max) {
    if(max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    } else {
        return Math.floor(Math.random() * (min + 1));
    }
};
dom.trim = function(str) {
    return str.replace(/^\s+|\s+$/g, '');
};
dom.hasClass = function(node, klass) {
    var newClasses = (node.className).replace(/\s+/g, ' ');
    return (' ' + newClasses + ' ').indexOf(' ' + klass + ' ') > -1;
};
dom.addClass = function(node, klass) {
    if (!node.className) {
        node.className = klass;
    } else if (!this.hasClass(node, klass)) {
        node.className += ' ' + klass;
    }
};
dom.removeClass = function(node, klass) {
    if (node.className && dom.hasClass(node, klass)) {
        var newClasses = node.className.replace(new RegExp('(\\s+|^)' + klass + '(\\s+|$)', 'g'), ' ');
        node.className = this.trim(newClasses);
    }
};
dom.toggleClass = function(node, klass) {
    if (dom.hasClass(node, klass)) {
        dom.removeClass(node, klass);
    } else {
        dom.addClass(node, klass);
    }
};
dom.addEvent = function(elem, type, handler) {
    if (document.addEventListener) {
        elem.addEventListener(type, handler, false);
    } else {
        elem.attachEvent("on" + type, handler);
    }
};
dom.preventBrowserEvent = function(e) {
    if (e.preventDefault) {
        e.preventDefault();
    } else {
        e.returnValue = false;
  }
};
function Cell(x, y) {
    this.isOpened = false;
    this.isRigged = false;
    this.isMarked = false;
    this.x = x;
    this.y = y;
    this.isClosed = true;
}
function Field(width, height, mines) {
    
  this.table = document.createElement('table');
    
    this.width = width;
    this.height = height;
    this.mines = mines;
    this.cells = [];
    
    this.createField();
  this.markCell();
  this.generateMines();
}
Field.prototype.createField = function() {  
    var row, y, x;
    
    this.table.id = 'field';
    
    for (y = 0; y < this.height; y++) {
        row = this.table.insertRow(y);
        for (x = 0; x < this.width; x++) {
            row.insertCell(x);
            this.cells.push(new Cell(x, y));
        }
    }
  
   document.body.appendChild(this.table);
};
Field.prototype.openCell = function() {
  dom.addEvent(this.table, 'click', function(e) {
        
        var target = e && e.target || event.srcElement;
    
        if (target.tagName != 'TD') {
            return false;
        }
        
    this.cells[this.getCellIndex(target)].isOpened = true;
    
        dom.preventBrowserEvent(e);
  });
};
Field.prototype.markCell = function() {
  dom.addEvent(this.table, 'contextmenu', function(e) {
        
        var target = e && e.target || event.srcElement;
    
        if (target.tagName == 'TD' && target.innerHTML === '') {
            target.innerHTML = '&#9873;';
        } else {
            target.innerHTML = '';
        }
    
        dom.preventBrowserEvent(e);
  });
};
Field.prototype.generateMines = function(table) {
    var randRow;
    for (var i = 0; i < this.mines; i++) {
        randRow = dom.rand(0, this.cells.length - 1);
        if (this.cells[randRow].isMine) {
            i--;
        } else {
            this.cells[randRow].isMine = true;
        }
    }
};
Field.prototype.checkForAroundMines = function(cell) {
  var cellIndex = this.getCellIndex(cell);
  var rowIndex = cell.parentNode.rowIndex;
  var aroundCells = [];
  
  for (var j = rowIndex - 1; j < rowIndex + 1; j++) {
    if (rowIndex === undefined) {
      continue;
    }
    for (var k = cellIndex - 1; k < cellIndex + 1; k++) {
      if (cellIndex < 0 || cellIndex > this.width - 1 || this.cells[cellIndex].isOpened || cellIndex === this.cells.indexof(cell) || !this.cells[this.getCellIndex(cellIndex)].isRigged) {
        continue;
      }
      
      aroundCells.push(this.cells[cellIndex]);
    }
  }
  
};
Field.prototype.getCellIndex = function(cell) {
  var rowIndex = cell.parentNode.rowIndex,
      cellIndex;
  if (row === 0) {
    return cell.cellIndex;
  } else {
    return rowIndex * this.width + cell.cellIndex - 1;  
  }
};
function Game(width, height, mines) {
    this.field = new Field(width, height, mines);
}
var game = new Game(9, 9, 10);
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