jQuery addClass example

Change class name on click in jQuery

by R

HTML

<div id="banner-message" class="test">
  <p>Hello World</p>
  <button>Conter</button>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#banner-message {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  font-size: 25px;
  text-align: center;
  transition: all 0.2s;
  margin: 0 auto;
  width: 300px;
}

button {
  background: #0084ff;
  border: none;
  border-radius: 5px;
  padding: 8px 14px;
  font-size: 15px;
  color: #fff;
}

#banner-message.alt {
  background: #0084ff;
  color: #fff;
  margin-top: 40px;
  width: 200px;
}

#banner-message.alt button {
  background: #fff;
  color: #000;
}

JavaScript

var someFunction1 = function () {
        var i;

        for (i = 0; i <= 300000; i++) {
          $('.test button').text(i);
        }
      };

      var someFunction2 = function () {
        var i,
        $el = $('.test button');

        for (i = 0; i <= 300000; i++) {
          $el.text(i);
        }
      };

      console.time('someFunction1');
      someFunction1();
      console.timeEnd('someFunction1');

      console.time('someFunction2');
      someFunction2();
      console.timeEnd('someFunction2');