Use `jQuery.fn.clone` method for a speeding up

```html
<!doctype html>
<meta charset="UTF-8">
<title>speed test</title>
<script src="./media/javascripts/jquery-1.10.2.js"></script>
<script>
$(function() {
  'use strict';

  var count = 100000;
  var styles = {
    backgroundColor: 'black',
    color: 'red',
    height: '100px',
    left: '0',
    lineHeight: '2',
    position: 'absolute',
    textAlign: 'center',
    textWeight: 'bold',
    top: '0',
    width: '100px'
  };

  function cloneNode() {
    var result = [];
    var base = $('<div/>');
    var i = 0;
    var elem;
    base.css(styles);
    while (++i < count) {
      elem = base.clone();
      result.push(elem);
    }
    return result;
  }

  function createElement() {
    var result = [];
    var i = 0;
    var elem;
    while (++i < count) {
      elem = $('<div/>');
      elem.css(styles);
      result.push(elem);
    }
    return result;
  }

  console.time('cloneNode');
  cloneNode();
  console.timeEnd('cloneNode'); // cloneNode: 2696.694ms

  console.time('createElement');
  createElement();
  console.timeEnd('createElement'); // createElement: 5546.545ms
});
</script>
```