返回值:Objectoffset()

Get the current coordinates of the first element in the set of matched elements, relative to the document.

The .offset() method allows us to retrieve the current position of an element relative to the document. Contrast this with .position(), which retrieves the current position relative to the offset parent. When positioning a new element on top of an existing one for global manipulation (in particular, for implementing drag-and-drop), .offset() is the more useful.

.offset() returns an object containing the properties top and left.

Note: jQuery does not support getting the offset coordinates of hidden elements.

示例:

Access the offset of the second paragraph:

<!DOCTYPE html>
<html>
<head>
<style>
p { margin-left:10px; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>

<p>Hello</p><p>2nd Paragraph</p>

<script>

var p = $("p:last");
var offset = p.offset();
p.html( "left: " + offset.left + ", top: " + offset.top );

</script>
</body>
</html>
演示:

示例:

Click to see the offset.

<!DOCTYPE html>
<html>
<head>
<style>
p { margin-left:10px; color:blue; width:200px; 
    cursor:pointer; }
span { color:red; cursor:pointer; }
div.abs { width:50px; height:50px; position:absolute;
          left:220px; top:35px; background-color:green; 
          cursor:pointer; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>

<div id="result">Click an element.</div>
<p>
  This is the best way to <span>find</span> an offset.
</p>

<div class="abs">
</div>
  

<script>


$("*", document.body).click(function (e) {
  var offset = $(this).offset();
  e.stopPropagation();
  $("#result").text(this.tagName + " coords ( " + offset.left + ", " +
                                  offset.top + " )");
});



</script>
</body>
</html>
演示:

返回值:jQueryoffset(coordinates)

Set the current coordinates of every element in the set of matched elements, relative to the document.

The .offset() setter method allows us to reposition an element. The element's position is specified relative to the document. If the element's position style property is currently static, it will be set to relative to allow for this repositioning.

示例:

Set the offset of the second paragraph:

<!DOCTYPE html>
<html>
<head>
<style>p { margin-left:10px; } </style>
<script src="jquery.min.js"></script>
</head>
<body>

<p>Hello</p><p>2nd Paragraph</p>

<script>

$("p:last").offset({ top: 10, left: 30 });

</script>
</body>
</html>
演示: