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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
</body>
</html>
 
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 MineSweeper() {
    
}
MineSweeper.prototype.init = function(width, height, mines) {
    var field = new Field(width, height, mines);
    field.createField();
};
function Field(width, height, mines) {
    this.width = width;
    this.height = height;
    this.mines = mines;
}
Field.prototype.createField = function() {  
    var table = document.createElement('table');
    table.id = 'field';
    
    for (var i = 0; i < this.width; i++) {
        var newRow = table.insertRow(i);
        for (var n = 0; n < this.height; n++) {
            var newCell = newRow.insertCell(n);
        }
    }
    
    this.generateMines(table);
    this.setFlag(table);
    document.body.appendChild(table);
};
Field.prototype.setFlag = function(table) {
    dom.addEvent(table, 'contextmenu', function(e) {
        
        var target = e && e.target || event.srcElement;
    
        if (target.tagName == 'TD' && target.innerHTML === '') {
            target.innerHTML = '&#9873;';
        } else if (target.tagName == 'TD' && target.innerHTML != '?'){
            target.innerHTML = '?';
        } else {
            target.innerHTML = '';
        }
        
        dom.preventBrowserEvent(e);
    });
};
Field.prototype.generateMines = function(table) {
    var randRows = dom.rand(0, table.rows.length - 1),
            randCells = dom.rand(0, table.rows[0].cells.length - 1);
    for (var i = 0; i < this.mines; i++) {
        randRow = table.rows[randRows].cells[randCells];
        if (randRow.innerHTML == '&#9762;') {
            i--;
        } else {
            randRow.innerHTML = '&#9762;';
        }
    }
};
var mineSweeper = new MineSweeper().init(9, 9, 10);
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