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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
  <style> 
    td { width: 28px; height: 28px; background: white; border: 1px solid black; cursor: pointer;} 
    table { border-collapse: collapse; margin-right: -1px;}
    button { display: inline-block; width: 120px; margin-top: 20px; padding: 5px 0; border: 2px solid #dadada; border-radius: 5px; text-align: center; cursor: pointer;}
    button:hover {background: #f2e41f; }
    .black { background: black; }
    .conversely td { background: black; }
    .conversely .black { background: white; }
  </style> 
</head>
<body>
  <button>Поменять цвета</button>
</body>
</html>
 
function trim(str) {
  if (str.charAt(0) == ' ') {
    str = str.substring(1, str.length);
  }
  
  if ( str.charAt(str.length - 1) == ' ' ) {
    str = str.substring(0, str.length - 1);
  }
  
  return str;
}
function hasClass(node, klass) {
  var classes = ' ' + node.className.replace('\\s', ' ') + ' ';
  
  if ( classes.indexOf(' ' + klass + ' ') + 1 ) { 
    return true; 
  }
  
  return false;
}
function addClass(node, klass) {
  if ( !hasClass(node, klass) ) {
    if ( node.className.length !== 0 ) {
      node.className += ' ' + klass;
    } else {
      node.className = klass;
    }
  }
  
  return node;
}
function removeClass(node, klass) {
  if ( hasClass(node, klass) ) {
    var classes = ' ' + node.className + ' ',
        regexp = new RegExp("\\s" + klass + "\\s", 'g');
    
    node.className = trim( classes.replace(regexp, ' ').replace(regexp, ' ') );
  }
  
  return node;
}
function toggleClass(node, klass) {
  if ( !hasClass(node, klass) ) {
    addClass(node, klass);
  } else {
    removeClass(node, klass);
  }
  
    return node;
}
var body = document.body;
body.insertBefore(document.createElement('table'), body.firstChild);
var table = body.getElementsByTagName('table')[0],
    tr,
    td = document.createElement('td');
for (var i = 16; i > 0; i--) {
  if ( i % 4 == 0 ) {
    tr = document.createElement('tr');
    table.appendChild(tr);
    tr = table.getElementsByTagName('tr')[4 - i / 4];
  }
  
  tr.appendChild(td);
}
var button = document.getElementsByTagName('button')[0];
table.addEventListener('mousedown', function(event) {
  var target = event.target || event.srcElement;
  
  console.log(toggleClass(target, 'black').className);
});
button.addEventListener('click', function(event) {
  console.log(toggleClass(table, 'conversely').className);
});
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anonymouspro
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