返回值:Integerheight()

Get the current computed height for the first element in the set of matched elements.

The difference between .css('height') and .height() is that the latter returns a unit-less pixel value (for example, 400) while the former returns a value with units intact (for example, 400px). The .height() method is recommended when an element's height needs to be used in a mathematical calculation.

This method is also able to find the height of the window and document.

$(window).height();   // returns height of browser viewport
$(document).height(); // returns height of HTML document

Note that .height() will always return the content height, regardless of the value of the CSS box-sizing property.

示例:

Show various heights. Note the values are from the iframe so might be smaller than you expected. The yellow highlight shows the iframe body. 

<!DOCTYPE html>
<html>
<head>
<style>
  body { background:yellow; }
  button { font-size:12px; margin:2px; }
  p { width:150px; border:1px red solid; }
  div { color:red; font-weight:bold; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>

<button id="getp">Get Paragraph Height</button>
  <button id="getd">Get Document Height</button>
  <button id="getw">Get Window Height</button>

  <div>&nbsp;</div>
  <p>
    Sample paragraph to test height
  </p>

<script>


    function showHeight(ele, h) {
      $("div").text("The height for the " + ele + 
                    " is " + h + "px.");
    }
    $("#getp").click(function () { 
      showHeight("paragraph", $("p").height()); 
    });
    $("#getd").click(function () { 
      showHeight("document", $(document).height()); 
    });
    $("#getw").click(function () { 
      showHeight("window", $(window).height()); 
    });



</script>
</body>
</html>
演示:

返回值:jQueryheight(value)

Set the CSS height of every matched element.

When calling .height(value), the value can be either a string (number and unit) or a number. If only a number is provided for the value, jQuery assumes a pixel unit. If a string is provided, however, any valid CSS measurement may be used for the height (such as 100px, 50%, or auto). Note that in modern browsers, the CSS height property does not include padding, border, or margin.

If no explicit unit was specified (like 'em' or '%') then "px" is concatenated to the value.

Note that .height(value) sets the height of the box in accordance with the CSS box-sizing property. Changing this property to border-box will cause this function to change the outerHeight of the box instead of the content height.

示例:

To set the height of each div on click to 30px plus a color change.

<!DOCTYPE html>
<html>
<head>
<style>div { width:50px; height:70px; float:left; margin:5px;
        background:rgb(255,140,0); cursor:pointer; }  </style>
<script src="jquery.min.js"></script>
</head>
<body>

<div></div>
  <div></div>

  <div></div>
  <div></div>
  <div></div>

<script>

$("div").one('click', function () {
      $(this).height(30)
             .css({cursor:"auto", backgroundColor:"green"});
    });

</script>
</body>
</html>
演示: