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HTML

CSS

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JavaScript

Babel includes JSX processing.

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Behavior

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HTML

              
                <input type="text" />
<input class="et" value="пароль" disabled>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus tristique pellentesque lectus aliquet volutpat. Quisque lacinia orci dapibus nulla varius, eu fermentum odio interdum. Aenean consequat commodo urna. In vitae nisi et nunc bibendum pharetra id in mauris. Mauris pharetra, erat in consectetur blandit, sem nisl efficitur diam, id elementum massa turpis vitae neque. Etiam non lorem tincidunt, eleifend libero vitae, aliquam elit. Fusce sit amet ligula tristique, porttitor erat at, cursus velit. Aenean facilisis tortor ex, a dictum nibh tincidunt et. Nullam et porta urna. Suspendisse porttitor ex quis metus suscipit, eu pharetra est ultricies. Aliquam erat volutpat. Fusce euismod mollis est. Maecenas id suscipit augue. Phasellus tempus, arcu id hendrerit porttitor, nulla magna mattis nisl, vitae posuere urna tellus non nisl. Nam blandit nisi ligula, eget rutrum lectus tincidunt pellentesque. Proin augue arcu, dignissim sit amet nisl quis, dictum porttitor libero. </p>
              
            
!

CSS

              
                body {
  color:red;
}
body.active {
  color:blue;
}
              
            
!

JS

              
                var et = $('.et').val(),
    body = $('body');
$(document).on('keyup','input',function(e){
  if($(e.target).val() == et) {
    body.addClass('active');
  }
  else {
    body.removeClass('active');
  }
});
              
            
!
999px

Console