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Решение с помощью window.matchMedia

A Pen By Максим

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HTML

            
              <div class="one" id="one">Я отвечаю за медиазапросы</div>
<div class="two" id="two">А я за JavaScript</div>

<span>Моя ширина ровно 600px</span>

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CSS

            
              body {
  margin: 0;

}
div {
    height: 60px;
    margin: 20px 0;
    font-size: 30px;
    background: red;
}
span {
    display: block;
    height: 30px;
    width: 600px;
    background: black;
}
@media screen and (min-width: 1px) and (max-width:600px) {
 
    .one {
        background: blue;
    }
}
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JS

            
                  var one = $("#one");
    var two = $("#two");

    var span = $("span");


  $(window).on('resize', function () {
      
      if (window.matchMedia("screen and (min-width: 1px) and (max-width:600px)").matches) {
         two.css({
                "background": "blue"

            })
        }else {
            two.css({
                "background": "red"

            })
        }
 
    })
!
999px
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