Примеры для jQuery .width()

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

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>width demo</title>
  <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="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<button id="getp">Get Paragraph Width</button>
<button id="getd">Get Document Width</button>
<button id="getw">Get Window Width</button>
<div>&nbsp;</div>
<p>
  Sample paragraph to test width
</p>
 
<script>
function showWidth( ele, w ) {
  $( "div" ).text( "The width for the " + ele + " is " + w + "px." );
}
$( "#getp" ).click(function() {
  showWidth( "paragraph", $( "p" ).width() );
});
$( "#getd" ).click(function() {
  showWidth( "document", $( document ).width() );
});
$("#getw").click(function() {
  showWidth( "window", $( window ).width() );
});
</script>
 
</body>
</html>

Демонстрация:

Change the width of each div the first time it is clicked (and change its color).

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>width demo</title>
  <style>
  div {
    width: 70px;
    height: 50px;
    float: left;
    margin: 5px;
    background: red;
    cursor: pointer;
  }
  .mod {
    background: blue;
    cursor: default;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<div>d</div>
<div>d</div>
<div>d</div>
<div>d</div>
<div>d</div>
 
<script>
var modWidth = 50;
$( "div" ).one( "click", function() {
  $( this ).width( modWidth ).addClass( "mod" );
  modWidth -= 8;
});
</script>
 
</body>
</html>

Демонстрация: