Hide or remove a div class at mobile viewport?

问题

First and foremost, I am very aware of CSS media queries. My problem is this: When you have div classes stacked in one div; Example:

<div class="class1 class2"></div>

And you want to remove "class2" @media (max-width: 768px) Creating an output of:

<div class="class1"></div>

...once the 768px threshold has been reached.

So far I have come up with nothing other than this non-functional code:

<script>
 jQuery(document).resize(function () {
  var screen = $(window)    
   if (screen.width < 768) {
    $(".class2").hide();
  }
     else {
       $(".class2").show();
      }
  });
</script>

I am really having a hard time finding an answer that works for this. I do not want to block the entire div's contents! Just remove one of two classes.

回答1:

I'm not sure I get this, but are you just trying to toggle a class?

$(window).on('resize', function () {
    $('.class1').toggleClass('class2', $(window).width() < 768);
});

FIDDLE

jQuery has addClass(), removeClass() and toggleClass() methods readily available.

Note that screen is already defined in javascript.

回答2:

Use the jQuery .removeClass() method:

 $(document).resize(function () {
     var screen = $(window);  

     if (screen.width < 768) {
         $('div').removeClass('class2');
     } else {
         $('div').addClass('class2');
     }

OR:

     screen.width < 768 ? $('div').removeClass('class2') : $('div').addClass('class2');
  });

回答3:

$(".class2").removeClass("class2")

And you should listen to the window not the document, so you can modify your code to the following:

<script>
 jQuery(window).resize(function () {
  var screen = $(window)    
   if (screen.width < 768) {
    $(".class2").removeClass("class2");
  }
     else {
       $(".class1").addClass("class2");
      }
  });
</script>

Of course, this will only toggle class2 properly if you want all class1 elements to have class2 when the screen width is greater than 768. If you don't want that, just add an extra class that has no effect, but acts as a flag indicating which elements should have class2.

来源：https://stackoverflow.com/questions/20819487/hide-or-remove-a-div-class-at-mobile-viewport