了解Retina设备CSS媒体查询 [英] Understanding Retina device CSS Media queries

问题描述

我正在处理一个WordPress主题，并尝试将视网膜启用的CSS查询合并到我的CSS文件中。

I am working on a WordPress theme and am trying to incorporate retina enabled CSS queries into my CSS file.

我想澄清一下，我有媒体

I would just like to clarify that I have the media queries set up correctly before I change out all my background images.

1. 我已将所有背景图片的大小加倍，并加上了
   他们用@ 2x命名约定。 [e-mail] 。


2. 我在我的代码中添加了一个jQuery函数，


3. 在我的CSS文档中，我有一个背景图像的普通CSS类。

常规CSS查询

.side-nav .arrow {
  background: url(../images/arrow-nav.png) no-repeat top left;
  width: 5px;
  height: 8px;
  display: inline-block;
  margin-left: 10px
}

这是正确的方式，我会更改.side-nav .arrow类为视网膜启用设备？当声明背景尺寸时，我保持原始较小图像的尺寸？

Is this the correct way i would change the .side-nav .arrow class for a retina enabled device? When declaring the background size do I keep the size that of the original smaller image?

/* All Retina Ready devices larger than 1.5 pixel ratio */
@media only screen and (-moz-min-device-pixel-ratio: 1.5),
only screen and (-o-min-device-pixel-ratio: 3/2),
only screen and (-webkit-min-device-pixel-ratio: 1.5),
only screen and (min-device-pixel-ratio: 1.5) {

    .side-nav .arrow { 
        background-image:url(../images/[e-mail]); 
        -webkit-background-size:5px 8px;
        -moz-background-size:5px 8px;
        -o-background-size:5px 8px;
        background-size:5px 8px 
    }
}

strong> jQuery代码

jQuery Code

$(function () {

    if (window.devicePixelRatio == 2) {

          var images = $("img.hires");

          /* loop through the images and make them hi-res */
          for(var i = 0; i < images.length; i++) {

            /* create new image name */
            var imageType = images[i].src.substr(-4);
            var imageName = images[i].src.substr(0, images[i].src.length - 4);
            imageName += "@2x" + imageType;

            /* rename image */
            images[i].src = imageName; 
          }
     }

});

谢谢

推荐答案

只要有某种形式的缩放，就像您声明

As long as there is some form of scaling taking place, like when you declare

< meta name =viewport content =width = ...> （适用于android / ios / blackberry / WP8）

<meta name="viewport" content="width=..."> (for android/ios/blackberry/WP8)

或

@ ms-viewport {width：...;} （适用于非WP8 IE10）

@ms-viewport {width: ... ;} (for non-WP8 IE10)

或...即使您没有声明任何东西，默认情况下，移动设备会自动缩放为viewport width = 980px

or ... even if you declare nothing most mobile devices will by default automatically scale such that viewport width=980px

使用'px'声明将以与它们的视口相同的比例存在，而不管它们的物理DPI / PPI

then all CSS dimensions you declare with 'px' will exist in the same proportion to their viewport regardless of differences between their physical DPI/PPI

之间的差异，这意味着你不应该改变单个事物关于您的样式类，但媒体查询匹配高分辨率设备时的背景图片的网址：

this means you shouldn't have to change a single thing about your style class except the background image's URL when the media query matches a high res device:

@media only screen and (-moz-min-device-pixel-ratio: 1.5),
only screen and (-o-min-device-pixel-ratio: 3/2),
only screen and (-webkit-min-device-pixel-ratio: 1.5),
only screen and (min-device-pixel-ratio: 1.5),
only screen and (min-resolution: 144dpi) {
    .side-nav .arrow { 
         background-image:url(../images/[e-mail]);
     }
}

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