返回值:jQueryhover(handlerIn(eventObject), handlerOut(eventObject))

Bind two handlers to the matched elements, to be executed when the mouse pointer enters and leaves the elements.

The .hover() method binds handlers for both mouseenter and mouseleave events. We can use it to simply apply behavior to an element during the time the mouse is within the element.

Calling $(selector).hover(handlerIn, handlerOut) is shorthand for: 

$(selector).mouseenter(handlerIn).mouseleave(handlerOut);

See the discussions for .mouseenter() and .mouseleave() for more details.

示例:

To add a special style to list items that are being hovered over, try:

<!DOCTYPE html>
<html>
<head>
<style>
  ul { margin-left:20px; color:blue; }
  li { cursor:default; }
  span { color:red; }
</style>
<script src="jquery.min.js"></script>
</head>
<body>

<ul>
    <li>Milk</li>
    <li>Bread</li>
    <li class='fade'>Chips</li>

    <li class='fade'>Socks</li>
  </ul>

<script>


$("li").hover(
  function () {
    $(this).append($("<span> ***</span>"));
  }, 
  function () {
    $(this).find("span:last").remove();
  }
);



//li with fade class
$("li.fade").hover(function(){$(this).fadeOut(100);$(this).fadeIn(500);});



</script>
</body>
</html>
演示:

示例:

To add a special style to table cells that are being hovered over, try:

jQuery 代码:
$("td").hover(
  function () {
    $(this).addClass("hover");
  },
  function () {
    $(this).removeClass("hover");
  }
);

示例:

To unbind the above example use:

jQuery 代码:
$("td").unbind('mouseenter mouseleave');

返回值:jQueryhover(handlerInOut(eventObject))

Bind a single handler to the matched elements, to be executed when the mouse pointer enters or leaves the elements.

The .hover() method, when passed a single function, will execute that handler for both mouseenter and mouseleave events. This allows the user to use jQuery's various toggle methods within the handler.

Calling $(selector).hover(handlerInOut) is shorthand for: 

$(selector).bind("mouseenter mouseleave",handlerInOut);

See the discussions for .mouseenter() and .mouseleave() for more details.

示例:

Slide the next sibling LI up or down on hover, and toggle a class.

<!DOCTYPE html>
<html>
<head>
<style>
  ul { margin-left:20px; color:blue; }
  li { cursor:default; }
  li.active { background:black;color:white; }
  span { color:red; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>

<ul>
    <li>Milk</li>
    <li>White</li>
    <li>Carrots</li>
    <li>Orange</li>
    <li>Broccoli</li>
    <li>Green</li>
  </ul>

<script>


$("li")
.filter(":odd")
.hide()
 .end()
.filter(":even")
.hover(
  function () {
    $(this).toggleClass("active")
      .next().stop(true, true).slideToggle();
  }
);




</script>
</body>
</html>
演示: