1.运行效果如图所示

bootstrap-动画过渡_bootstrap


2.实现代码如下

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>动画过渡</title>
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" 
    href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" 
    integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" 
    crossorigin="anonymous">

    <!-- 可选的 Bootstrap 主题文件（一般不用引入） -->
    <link rel="stylesheet" 
    href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" 
    integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" 
    crossorigin="anonymous">
</head>
<body>
    <button class="btn btn-primary" type="button">点击我</button>
    <div class="modal fade" id="mymodal">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal">
                    <span aria-hidden="true">&times;</span><span class="sr-only">
                    Close</span></button>
                    <h4 class="modal-title">模态弹出窗标题</h4>
                </div>
                <div class="modal-body">
                    <p>模态弹出窗主体内容</p>
                </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">保存</button>
                </div>
            </div><!-- /.modal-content -->
        </div><!-- /.modal-dialog -->
    </div><!-- /.modal -->


    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
    <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
    <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js" 
    integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" 
    crossorigin="anonymous"></script>
    <script>
        $(function(){
            $(".btn").click(function(){
                 $("#mymodal").modal("toggle");
            });
        });
    </script>
</body>
</html>

bootstrap-动画过渡_动画过渡_02