1. draggable()
滑动条demo：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.con{
width:300px;
height:300px;
border:1px solid #000;
margin:50px auto 0;
}
.box{
width:50px;
height:50px;
background-color:hotpink;
cursor:pointer;
}
</style>
<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
<script type="text/javascript" src="js/jquery-ui.min.js"></script>
<script type="text/javascript">
$(function () {
//使得box可以鼠标拖动
$('.box').draggable({
//约束元素在父级内拖动
containment:'parent',
//约束元素只能横向拖动
axis:'x',
//元素拖动时透明度变为0.6
opacity:0.6,
//ui里面有什么可以用console.log（ui）查看
drag:function (ev,ui) {
var nowleft = ui.position.left;
}
});
})
</script>
</head>
<body>
<div class="con">
<div class="box"></div>
</div>
</body>
</html>