.show( effect [, options ] [, duration ] [, complete ] )Returns: jQuery
Description: Display the matched elements, using custom effects.
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.show( effect [, options ] [, duration ] [, complete ] )
-  effectType: StringA string indicating which effect to use for the transition.
 -  optionsType: ObjectEffect-specific properties and easing.
 -  duration (default:
400)A string or number determining how long the animation will run. -  completeType: Function()A function to call once the animation is complete, called once per matched element.
 
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 -  
.show( options )
-  optionsType: ObjectAll animation settings. The only required property is
effect.-  effectType: StringA string indicating which effect to use for the transition.
 -  easing (default:
"swing")Type: StringA string indicating which easing function to use for the transition. -  duration (default:
400)A string or number determining how long the animation will run. -  completeType: Function()A function to call once the animation is complete, called once per matched element.
 -  queue (default:
true)A Boolean indicating whether to place the animation in the effects queue. Iffalse, the animation will begin immediately. A string can also be provided, in which case the animation is added to the queue represented by that string. 
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This plugin extends jQuery's built-in .show() method. If jQuery UI is not loaded, calling the .show() method may not fail directly, as the method still exists. However, the expected behavior will not occur.
Example:
Show a div using the fold effect.
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>show demo</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/smoothness/jquery-ui.css">
  <style>
  div {
    display: none;
    width: 100px;
    height: 100px;
    background: #ccc;
    border: 1px solid #000;
  }
  </style>
  <script src="//code.jquery.com/jquery-1.12.4.js"></script>
  <script src="//code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
 
<button>show the div</button>
<div></div>
 
<script>
$( "button" ).click(function() {
  $( "div" ).show( "fold", 1000 );
});
</script>
 
</body>
</html>