2.3 弹出层效果

<div class="maskFuc">
    <div class="maskWrap"></div>
    <div class="mask">
        <h2> 我们是遮罩层内容的头部<span>×</span></h2>
    </div>
    <button class="buttonMask">快来点击人家哦，有惊喜吆</button>
</div>

 *{
            box-sizing: border-box;
            padding: 0px;
            margin: 0px;
        }
        .maskWrap{
            background: rgba(250,0,250,0.2);
            width:100%;
            height:100%;
            position: absolute;
            top:0;
            left:0;
            display: none;
        }
        .mask{
            position: absolute;
            top:50%;
            left:50%;
            border:2px solid yellow;
            width:300px;
            height:200px;
            background-color: white;
            display: none;
            margin-top:-100px;
            margin-left:-150px;
            z-index:9999;
        }
        .mask h2{
            font-size:16px;
            font-family: "微软雅黑 Light";
            text-align:center;
            height:30px;
            line-height:30px;
            background-color: orangered;
        }
        .mask h2 span{
            display: inline-block;
            float: right;
            color:red;
            background-color: white;
            font-size: 30px;
            cursor: pointer;

        }
        button{
            margin:0px auto;
            display: block;
            margin-top:20px;
        }

 (function($){
        $.fn.maskFuc=function(){
            return this.each(function(){
                var $this=$(this);
                $this.find(".buttonMask").click(function(){
                    $this.find(".maskWrap").show();
                    $this.find(".mask").show();
                });
                $this.find(".mask").find("span").click(function(){
                    $this.find(".maskWrap").hide();
                    $this.find(".mask").hide()
                });
            });
        };
    })(jQuery);
    $("body").maskFuc();