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答案：background-attachment

----- JSBin 示例----

答案是使用background-attachment

截屏

原始问题

我正在做一个项目，我们想要显示一个“透视”到背景的模态，但模态面板之外的任何地方都被稍微掩盖了。

我已经成功使用border: 10000px rgba(0,0,0,0.3)了，border-radius: 10010px但这是一个 hack，我无法用box-shadow

有没有这样做的标准方法？如果您能想到一种将透明度滤镜渐变应用于图像的方法，则可以加分。

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2 回答 2

2

我认为你在这里得到的最好的选择是有一个 3 行，其中中间一个包含 3 列，并且上下行和左右列（中间行）具有变暗的背景：

$(function() {
  $('button').click(function() {
    tpl = '<div class="modal-reverse-container"><div class="r1"></div><div class="r2"><div class="c1"></div><div class="c2"></div><div class="c3"></div></div><div class="r3"></div></div>'
    $('body').append($(tpl));
    $('.modal-reverse-container').width($(document).width());
    $('.modal-reverse-container').height($(document).height());
    $('.modal-reverse-container r1, .modal-reverse-container r2').height($(document).height());
  });
  $(document).on('click', '.modal-reverse-container', function() {
    $(this).remove();
  });
});
td {
  text-align: center;
  background: red;
}
.modal-reverse-container {
  position: absolute;
  top: 0;
  left: 0;
}
.modal-reverse-container .r1, .modal-reverse-container .r2, .modal-reverse-container .r3 {
  height: 33%;
}
.modal-reverse-container .r1, .modal-reverse-container .r3 {
  background: rgba(0, 0, 0, 0.7);
}
.modal-reverse-container .r2 .c1, .modal-reverse-container .r2 .c2, .modal-reverse-container .r2 .c3 {
  width: 33%;
  height: 100%;
  float: left;
}
.modal-reverse-container .r2 .c3 {
  float: right;
}
.modal-reverse-container .r2 .c1, .modal-reverse-container .r2 .c3 {
  background: rgba(0, 0, 0, 0.7);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table width="100%">
  <tr>
    <td>1</td>
    <td>2</td>
    <td>3</td>
  </tr>
</table>
<img src="https://dummyimage.com/600x400/d950d9/fff" />
<div>
  Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32.
</div>
<button>Set reverse-modal</button>

于 2016-10-13T01:35:42.310 回答
1

截屏

---- JSBin 示例----

答案是使用background-attachment

background-attachment: fixed;
background-size: cover;
background-position: center center;
background-image: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.4)), url(http://imgur.com/oVaQJ8F.png);

.modal-backdrop {
    background: url(myurl.png) center center / cover no-repeat fixed
}

.modal-panel {
    background: url(myurl.png) center center / cover no-repeat fixed
}

最好的值是fixed（并非所有设备都支持固定），以便您的背景和模态可以共享相同的视口X，并且Y (0, 0)默认情况下

然后你用background-size百分比或cover

使用background:速记时，请确保使用 a与金额/分开background-positionbackground-scale

我在旧设备上遇到了一个错误，所以我使用local然后手动计算leftX并在我的视口上topY排列背景和模式面板。background-position(0, 0)

然后我用相同的百分比缩放两个图像，以覆盖屏幕

我还使用了渐变，信用——如何使背景图像变暗

于 2016-10-18T06:02:28.547 回答