通过把 step 选项设置为一个整数来设置滑块值的增量,通常是滑块最大值的除数。默认增量是 1。

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery UI 滑块(Slider) - 对齐增量</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
  <script src="//code.jquery.com/jquery-1.9.1.js"></script>
  <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
  <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css">
  <script>
  $(function() {
    $( "#slider" ).slider({
      value:100,
      min: 0,
      max: 500,
      step: 50,
      slide: function( event, ui ) {
        $( "#amount" ).val( "$" + ui.value );
      }
    });
    $( "#amount" ).val( "$" + $( "#slider" ).slider( "value" ) );
  });
  </script>
</head>
<body>
 
<p>
  <label for="amount">捐款金额($50 增量):</label>
  <input type="text" id="amount" style="border:0; color:#f6931f; font-weight:bold;">
</p>
 
<div id="slider"></div>
 
 
</body>
</html>