jQuery UI的Draggable opacity 选项

jQuery UI由GUI小工具，视觉效果和使用jQuery，CSS和HTML实现的主题组成，jQuery UI对于构建网页的UI界面非常有用。jQuery UI的Draggable opacity 选项是用来设置被拖动时帮助器的不透明度。

语法:

$( ".selector" ).draggable({
    opacity: val
});

CDN链接：首先，添加你的项目需要的jQuery UI脚本。

<link rel=”stylesheet” href=”//code.jquery.com/ui/1.12.1/themes/smoothness/jquery-ui.css”>
<script src=”//code.jquery.com/jquery-1.12.4.js”></script>
<script src=”//code.jquery.com/ui/1.12.1/jquery-ui.js”></script>

示例:

<!doctype html>
<html lang="en">
  
<head>
    <meta charset="utf-8">
    <link rel="stylesheet" href=
"//code.jquery.com/ui/1.12.1/themes/smoothness/jquery-ui.css">
    <script src=
"//code.jquery.com/jquery-1.12.4.js">
    </script>
    <script src=
"//code.jquery.com/ui/1.12.1/jquery-ui.js">
    </script>
  
    <style>
        h1 {
            color: green;
        }
  
        #div_element {
            width: 150px;
            height: 150px;
            background: green;
            display: flex;
            justify-content: center;
            align-items: center;
            text-align: center;
        }
    </style>
</head>
  
<body>
    <h1>GeeksforGeeks</h1>
  
    <h3>jQuery UI Draggable opacity Option</h3>
  
    <div id="div_element">Div content</div>
  
    <script>
        (function () {
            ("#div_element").draggable({
                opacity: 0.4
            });
        });
    </script>
</body>
  
</html>