bootstrap 模态框实现拖动，移除模态框灰色背景和同个页面多次弹出模态框实现

内容如标题,不多说 直接上实现代码

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"> 
	<title>Bootstrap 实例 - 模态框（Modal）插件</title>
	<-- 模态框拖拽插件 -->
	<link rel="stylesheet" href="https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.min.css" />
	<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css">

	<script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
	<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
	<-- 模态框拖拽插件 -->
	<script src="https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.min.js"></script>
</head>
<body>

<h2>创建模态框（Modal）</h2>
<h4>第一个模态框</h4>
<!-- 按钮触发模态框 -->
<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
	开始演示第一个模态框
</button>
<!-- 模态框（Modal） -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true" draggable="true">
	<div class="modal-dialog">
		<div class="modal-content">
			<div class="modal-header">
				<button type="button" class="close" data-dismiss="modal" aria-hidden="true">
					&times;
				</button>
				<h4 class="modal-title" id="myModalLabel">
					模态框（Modal）标题
				</h4>
			</div>
			<div class="modal-body">
				第一个模态框
			</div>
			<div class="modal-footer">
				<button type="button" class="btn btn-default" data-dismiss="modal">关闭
				</button>
				<button type="button" class="btn btn-primary">
					提交更改
				</button>
			</div>
		</div><!-- /.modal-content -->
	</div><!-- /.modal -->
</div>



<h4>第二个模态框</h4>
<!-- 按钮触发模态框 -->
<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal3">
	开始演示第二个模态框
</button>
<!-- 模态框（Modal） -->
<div class="modal fade" id="myModal3" tabindex="2" role="dialog" aria-labelledby="myModalLabel3" aria-hidden="true">
	<div class="modal-dialog">
		<div class="modal-content">
			<div class="modal-header">
				<button type="button" class="close" data-dismiss="modal" aria-hidden="true">
					&times;
				</button>
				<h4 class="modal-title" id="myModalLabel3">
					模态框（Modal）标题
				</h4>
			</div>
			<div class="modal-body">
				第二个模态框,
				第三个模态框内容
				<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal2">
					开始演示模态框三
				</button>
			</div>
			<div class="modal-footer">
				<button type="button" class="btn btn-default" data-dismiss="modal">关闭
				</button>
				<button type="button" class="btn btn-primary">
					提交更改
				</button>
			</div>
		</div><!-- /.modal-content -->
	</div><!-- /.modal -->	
</div>

<h4>第三个模态框触发按钮在第二个模态框里边</h4>
<!-- 按钮触发模态框 -->

<!-- 模态框（Modal） -->
<div class="modal fade" id="myModal2" tabindex="3" role="dialog" aria-labelledby="myModalLabel2" aria-hidden="true">
	<div class="modal-dialog">
		<div class="modal-content">
			<div class="modal-header">
				<button type="button" class="close" data-dismiss="modal" aria-hidden="true">
					&times;
				</button>
				<h4 class="modal-title" id="myModalLabel2">
					模态框（Modal）标题
				</h4>
			</div>
			<div class="modal-body">
				第三个模态框
				第四个模态框
				<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal4">
					开始演示模态框四
				</button>
			</div>
			<div class="modal-footer">
				<button type="button" class="btn btn-default" data-dismiss="modal">关闭
				</button>
				<button type="button" class="btn btn-primary">
					提交更改
				</button>
			</div>
		</div><!-- /.modal-content -->
	</div><!-- /.modal -->	
</div>

<h4>第四个模态框触发按钮在第三个模态框里边</h4>
<!-- 按钮触发模态框 -->

<!-- 模态框（Modal） -->
<div class="modal fade" id="myModal4" tabindex="4" role="dialog" aria-labelledby="myModalLabel4" aria-hidden="true" >
	<div class="modal-dialog">
		<div class="modal-content">
			<div class="modal-header">
				<button type="button" class="close" data-dismiss="modal" aria-hidden="true">
					&times;
				</button>
				<h4 class="modal-title" id="myModalLabel4">
					模态框（Modal）标题
				</h4>
			</div>
			<div class="modal-body">
				第三个模态框
			</div>
			<div class="modal-footer">
				<button type="button" class="btn btn-default" data-dismiss="modal">关闭
				</button>
				<button type="button" class="btn btn-primary">
					提交更改
				</button>
			</div>
		</div><!-- /.modal-content -->
	</div><!-- /.modal -->	
</div>
<style>
<-- 移除灰色背景 -->
.modal-backdrop {
  opacity: 0 !important;
  filter: alpha(opacity=0) !important;
}
</style>

<script>
  $(function() {
  //实现模态框拖拽(不加参数，可以点击模态框任何地方拖拽)
   // $( ".modal-dialog" ).draggable();
    
//bootstrap模态框头部支持拖动
    $(".modal-dialog" ).draggable({
      cursor: "move",
      handle: '.modal-header'
    });
  });
  </script>

</body>

</html>

效果图

代码可直接拷贝到本地查看 运行效果 ，这里就不做演示了。

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