The URL : https://johnny.github.io/jquery-sortable/
I download and run it on localhost, but it's not working
I run example.html
My URL is like this : http://localhost/ngetest/drag_drop/source/example.html
The result :

I update example.html to be like this :
<style type="text/css">
body.dragging, body.dragging * {
cursor: move !important;
}
.dragged {
position: absolute;
opacity: 0.5;
z-index: 2000;
}
ol.example li.placeholder {
position: relative;
/** More li styles **/
}
ol.example li.placeholder:before {
position: absolute;
/** Define arrowhead **/
}
</style>
<ol class='example'>
<li>First</li>
<li>Second</li>
<li>Third</li>
</ol>
<script src='js/jquery-sortable.js'></script>
<script type="text/javascript">
$(function () {
$("ol.example").sortable();
});
</script>
But just the same. It's not working
Thank you