屏幕尺寸的 CSS 媒体查询

Question

我目前正在尝试设计一种与多种屏幕尺寸兼容的布局。 下面列出了我正在设计的屏幕尺寸：

屏幕尺寸：

1. 640x480
2. 800x600
3. 1024x768
4. 1280x1024（及更大）

我遇到的问题是创建 css3 媒体查询，以便当窗口的宽度达到这些宽度之一时我的布局会发生变化。 下面是我目前正在使用的媒体查询示例，但它对我不起作用，所以我想知道是否有人可以帮助我修复它。

<link rel="stylesheet" type="text/css" media="screen and (max-width: 700px)" href="css/devices/screen/layout-modify1.css">
<link rel="stylesheet" type="text/css" media="screen and (min-width: 701px) and (max-width: 900px)" href="css/devices/screen/layout-modify2.css">
<link rel="stylesheet" type="text/css" media="screen and (max-width: 901px)" href="css/devices/screen/layout-modify3.css">

我尝试使用一组新的媒体查询，但它们仍然不适合我。 有人可以帮我解释一下我做错了什么吗？ 你们中的一些人已经尝试过解释，但我不明白。 新的媒体查询如下所示：

<link rel="stylesheet" type="text/css" media="screen and (max-width: 640px)" href="css/devices/screen/layout-modify1.css">

    <link rel="stylesheet" type="text/css" media="screen and (max-width: 800px)" href="css/devices/screen/layout-modify2.css">

    <link rel="stylesheet" type="text/css" media="screen and (max-width: 1024px)" href="css/devices/screen/layout-modify3.css">

    <link rel="stylesheet" type="text/css" media="screen and (max-width: 1280px)" href="css/devices/screen/layout-modify4.css">

Answer 1

把它全部放在一个文档中并使用这个：

/* Smartphones (portrait and landscape) ----------- */
@media only screen 
and (min-device-width : 320px) 
and (max-device-width : 480px) {
  /* Styles */
}

/* Smartphones (landscape) ----------- */
@media only screen 
and (min-width : 321px) {
  /* Styles */
}

/* Smartphones (portrait) ----------- */
@media only screen 
and (max-width : 320px) {
  /* Styles */
}

/* iPads (portrait and landscape) ----------- */
@media only screen 
and (min-device-width : 768px) 
and (max-device-width : 1024px) {
  /* Styles */
}

/* iPads (landscape) ----------- */
@media only screen 
and (min-device-width : 768px) 
and (max-device-width : 1024px) 
and (orientation : landscape) {
  /* Styles */
}

/* iPads (portrait) ----------- */
@media only screen 
and (min-device-width : 768px) 
and (max-device-width : 1024px) 
and (orientation : portrait) {
  /* Styles */
}

/* Desktops and laptops ----------- */
@media only screen 
and (min-width : 1224px) {
  /* Styles */
}

/* Large screens ----------- */
@media only screen 
and (min-width : 1824px) {
  /* Styles */
}

/* iPhone 4 - 5s ----------- */
@media
only screen and (-webkit-min-device-pixel-ratio : 1.5),
only screen and (min-device-pixel-ratio : 1.5) {
  /* Styles */
}

/* iPhone 6 ----------- */
@media
only screen and (max-device-width: 667px) 
only screen and (-webkit-device-pixel-ratio: 2) {
  /* Styles */
}

/* iPhone 6+ ----------- */
@media
only screen and (min-device-width : 414px) 
only screen and (-webkit-device-pixel-ratio: 3) {
  /*** You've spent way too much on a phone ***/
}

/* Samsung Galaxy S7 Edge ----------- */
@media only screen
and (-webkit-min-device-pixel-ratio: 3),
and (min-resolution: 192dpi)and (max-width:640px) {
 /* Styles */
}

来源： http ://css-tricks.com/snippets/css/media-queries-for-standard-devices/

在这一点上，我肯定会考虑使用em值而不是像素。 有关更多信息，请查看此帖子： https ://zellwk.com/blog/media-query-units/。

Answer 2

除非你有比这更多的样式表，否则你搞砸了你的断点：

#1 (max-width: 700px)
#2 (min-width: 701px) and (max-width: 900px)
#3 (max-width: 901px)

第三个媒体查询可能是min-width: 901px 。 现在，它与 #1 和 #2 重叠，并且仅在屏幕恰好为 901px 宽时自行控制页面布局。

编辑更新的问题：

(max-width: 640px)
(max-width: 800px)
(max-width: 1024px)
(max-width: 1280px)

媒体查询不像 catch 或 if/else 语句。 如果任何条件匹配，那么它将应用它匹配的每个媒体查询的所有样式。 如果您只为所有媒体查询指定min-width ，则可能会匹配部分或所有媒体查询。 在你的例子中，一个 640px 宽的设备匹配你所有的 4 个媒体查询，所以所有的样式表都被加载了。 您最有可能寻找的是：

(max-width: 640px)
(min-width: 641px) and (max-width: 800px)
(min-width: 801px) and (max-width: 1024px)
(min-width: 1025px)

现在没有重叠。 仅当设备的宽度介于指定的宽度之间时，样式才会应用。

Answer 3

对于所有智能手机和大屏幕，请使用这种媒体查询格式

/* Smartphones (portrait and landscape) ----------- */

@media only screen and (min-device-width : 320px) and (max-device-width : 480px) {
/* Styles */
}

/* Smartphones (landscape) ----------- */

@media only screen and (min-width : 321px) {
/* Styles */
}



/* Smartphones (portrait) ----------- */

@media only screen and (max-width : 320px) {
/* Styles */
}

/* iPads (portrait and landscape) ----------- */

@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) {
/* Styles */
}

/* iPads (landscape) ----------- */

@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : landscape) {
/* Styles */
}

/* iPads (portrait) ----------- */

@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : portrait) {
/* Styles */
}

/**********
iPad 3
**********/

@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : landscape) and (-webkit-min-device-pixel-ratio : 2) {
/* Styles */
}

@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : portrait) and (-webkit-min-device-pixel-ratio : 2) {
/* Styles */
}

/* Desktops and laptops ----------- */

@media only screen  and (min-width : 1224px) {
/* Styles */
}

/* Large screens ----------- */
@media only screen  and (min-width : 1824px) {
/* Styles */
}

/* iPhone 4 ----------- */

@media only screen and (min-device-width : 320px) and (max-device-width : 480px) and (orientation : landscape) and (-webkit-min-device-pixel-ratio : 2) {
/* Styles */
}

@media only screen and (min-device-width : 320px) and (max-device-width : 480px) and (orientation : portrait) and (-webkit-min-device-pixel-ratio : 2) {
/* Styles */
}

/* iPhone 5 ----------- */

@media only screen and (min-device-width: 320px) and (max-device-height: 568px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

@media only screen and (min-device-width: 320px) and (max-device-height: 568px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

/* iPhone 6 ----------- */

@media only screen and (min-device-width: 375px) and (max-device-height: 667px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

@media only screen and (min-device-width: 375px) and (max-device-height: 667px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

/* iPhone 6+ ----------- */

@media only screen and (min-device-width: 414px) and (max-device-height: 736px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

@media only screen and (min-device-width: 414px) and (max-device-height: 736px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

/* Samsung Galaxy S3 ----------- */

@media only screen and (min-device-width: 320px) and (max-device-height: 640px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

@media only screen and (min-device-width: 320px) and (max-device-height: 640px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

/* Samsung Galaxy S4 ----------- */
@media only screen and (min-device-width: 320px) and (max-device-height: 640px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 3){
/* Styles */
}

@media only screen and (min-device-width: 320px) and (max-device-height: 640px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 3){
/* Styles */
}

/* Samsung Galaxy S5 ----------- */

@media only screen and (min-device-width: 360px) and (max-device-height: 640px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 3){
/* Styles */
}

@media only screen and (min-device-width: 360px) and (max-device-height: 640px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 3){
/* Styles */
}