遮罩层样式及隐藏

遮罩层样式，CSS：

  .add-pop-up-windows{
            position:fixed;
            _position:absolute;
            width:100%;
            height:100%;
            left:0;
            top:0;
            background:rgba(0,0,0,0.5);
            -moz-opacity:0.5;
            filter:alpha(opacity=50);
            z-index:3;
            display: none;
        }
        .add-pop-up-windows-content{
            background-color: white;
            width: 6.9rem;
            margin: 4.4rem .3rem 0 .3rem;
            border-radius: .1rem;
            padding: 0;
            font-family: "Microsoft YaHei";
        }

html：

<div class="aduit-ti-jiao">
    <button class="aduit-ti-jiao-left">驳  回</button>
    <button class="aduit-ti-jiao-right">通  过</button>
</div>
<div class="add-pop-up-windows" id="window">
    <div class="add-pop-up-windows-content" id="content">
        <div class="add-pop-up-windows-content-title">驳回原因：</div>
        <textarea class="add-pop-up-windows-content-textarea">必填</textarea>
        <div class="add-pop-up-windows-content-bottom">
            <div class="add-pop-up-windows-content-bottom-left">我再想想</div>
            <div class="add-pop-up-windows-content-bottom-right">确定</div>
        </div>
    </div>
</div>

点击背景，隐藏遮罩层，JavaScript：

//弹窗显示
    $('.aduit-ti-jiao-left').click(function () {
        document.getElementById('window').style.display = 'block';
    });
    //弹窗隐藏
    $("#window").click(function (event) {
        $('#window').hide();
    });
    $('#content').click(function () {
        event.stopPropagation(); // 阻止事件向上冒泡
    });

 效果图：