返回值:jQueryremoveClass([className])

Remove a single class, multiple classes, or all classes from each element in the set of matched elements.

If a class name is included as a parameter, then only that class will be removed from the set of matched elements. If no class names are specified in the parameter, all classes will be removed.

More than one class may be removed at a time, separated by a space, from the set of matched elements, like so:

$('p').removeClass('myClass yourClass')

This method is often used with .addClass() to switch elements' classes from one to another, like so: 

$('p').removeClass('myClass noClass').addClass('yourClass');

Here, the myClass and noClass classes are removed from all paragraphs, while yourClass is added.

To replace all existing classes with another class, we can use .attr('class', 'newClass') instead.

As of jQuery 1.4, the .removeClass() method allows us to indicate the class to be removed by passing in a function. 

$('li:last').removeClass(function() {
          return $(this).prev().attr('class');
        });

This example removes the class name of the penultimate <li> from the last <li>.

示例:

Remove the class 'blue' from the matched elements.

<!DOCTYPE html>
<html>
<head>
<style>

  p { margin: 4px; font-size:16px; font-weight:bolder; }
  .blue { color:blue; }
  .under { text-decoration:underline; }
  .highlight { background:yellow; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>

<p class="blue under">Hello</p>
  <p class="blue under highlight">and</p>
  <p class="blue under">then</p>

  <p class="blue under">Goodbye</p>

<script>

$("p:even").removeClass("blue");

</script>
</body>
</html>
演示:

示例:

Remove the class 'blue' and 'under' from the matched elements.

<!DOCTYPE html>
<html>
<head>
<style>
  p { margin: 4px; font-size:16px; font-weight:bolder; }
  .blue { color:blue; }
  .under { text-decoration:underline; }
  .highlight { background:yellow; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>

<p class="blue under">Hello</p>

  <p class="blue under highlight">and</p>
  <p class="blue under">then</p>
  <p class="blue under">Goodbye</p>

<script>

$("p:odd").removeClass("blue under");

</script>
</body>
</html>
演示:

示例:

Remove all the classes from the matched elements.

<!DOCTYPE html>
<html>
<head>
<style>

  p { margin: 4px; font-size:16px; font-weight:bolder; }
  .blue { color:blue; }
  .under { text-decoration:underline; }
  .highlight { background:yellow; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>

<p class="blue under">Hello</p>
  <p class="blue under highlight">and</p>
  <p class="blue under">then</p>

  <p class="blue under">Goodbye</p>

<script>

$("p:eq(1)").removeClass();

</script>
</body>
</html>
演示: