JQuery封装一个蒙层插件

(function($){
        $.extend({
                                dialog:function(obj) {
                                        //title  标题
                                        //content 内容
                                        //cancel true|false 是否显示取消按钮
                                        //success 点击确定的回调函数
                                        obj.title = obj.title || "提示";
                                        //蒙层
                                        var modal = $("<div class='modal'></div>");
                                        var body = $("<div class='modal-body'></div>");
                                        var title = $("<p class='title'></p>").html(obj.title);
                                        var content = $("<div class='content'></div>").html(obj.content);
                                        var option = $("<div class='option'><button>确定</button><button class='cancel'>取消</button></div>");
                                        if(!obj.cancel) {
                                                option.find('button:last').remove();
                                        }
                                        option.find('button').click(function(){
                                                if($(this).index()==0) {
                                                        if(obj.success) {
                                                                obj.success();
                                                        }
                                                }
                                                $('.modal').remove();
                                                $('.modal-body').remove();
                                        })
                                        body.append(title).append(content).append(option);
                                        //将蒙层和提示信息插入到页面body中
                                        $('body').append(modal).append(body);
                                }
                        })
})(jQuery);

  

        .modal {
            width: 100%;
            height: 100%;
            background-color: #333;
            opacity: 0.4;
            position: absolute;
            z-index: 9;
            left: 0;
            top: 0;
        }
        .modal-body {
            width: 250px;
            height: 150px;
            background-color: #fff;
            position: absolute;
            z-index: 10;
            left: 40%;
            margin-top: 200px;
            border-radius: 5px;
            border: 1px solid #bebebe;
            text-align: center;
        }
        
        .title {
            margin: 0;
            height: 40px;
            line-height: 40px;
            font-size: 20px;
        }
        
        .content {
            margin: 10px;
            font-size: 14px;
        }
        
        .option button {
            margin-right: 20px;
            background-color: #fff;
            border: 1px solid transparent;
            height: 30px;
            width: 80px;
            color: #fff;
            background-color: #337ab7;
        }
        
        .cancel {
            background-color: #d9534f !important;
        }
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
            <meta content="IE=edge" http-equiv="X-UA-Compatible">
                <link rel="stylesheet" href="js/jqueryDialog/jquery.dialog.css">
            <script src="js/jquery-1.11.3.js"></script>
                        <script src='js/jqueryDialog/jquery.dialog.js'></script>
          <script>
           $(function() {
                        $('.btn').click(function() {
                                $.dialog({
                                        title:'用户提示',
                                        content:"您确定要删除当前选择的用户类型么?",
                                        cancel:true,
                                        success:function() {
                                                alert('点击确定处理的事件');
                                        }
                                });
                        })
                })
                    </script>
                    <style>
                
                    </style>
    </head>
    <body>
        <button class="btn">
            弹出框
        </button>
    </body>
</html>