Responsive设计在现代Web设计中可谓是越来越流行，但很同学们并未理解其真正的设计概念，往往把Responsive视为一种自适应布局。当然有很多同学也在尝试动写Responsive的案例，但如何取其断点左右纠结，如何设置哪几个断点？又从何入手？

Responsive中的断点都依赖于CSS3的Media Queries来决断，今天特意根据一些Responsive框架整理了一些常见的Media Queries片段，以供大家参考：

CSS3 Media Queries片段

在这里主要分成三类：移动端、PC端以及一些常见的响应式框架的Media Queries片段。

移动端Media Queries片段

iPhone5

@media screen and (device-aspect-ratio: 40/71) {}或者：@media screen and (device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2){}	

iPhone 5 In Portrait & Landscape

@media only screenand (min-device-width : 320px)and (max-device-width : 568px){// CSS Style}	

iPhone 5 In Landscape

@media only screenand (min-device-width : 320px)and (max-device-width : 568px)and (orientation : landscape){// CSS Style}	

iPhone 5 In Portrait

@media only screenand (min-device-width : 320px)and (max-device-width : 568px)and (orientation : portrait){// CSS Style}	

iPone4

@media only screen and (-webkit-min-device-pixel-ratio : 1.5), only screen and (min-device-pixel-ratio : 1.5) {}	

iPhone 3G

@media screen and (device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 1){}	

iPhone

/*Landscape*/@media screen and (max-device-width: 480px) {}/*Portrait*/@media screen and (max-device-width: 320px) {}	

Blackberry Torch

@media screen and (max-device-width: 480px) {}	

Samsung S3

@media only screen and (-webkit-device-pixel-ratio: 2) {}	

Google Nexus 7

@media screen and (device-width: 600px) and (device-height: 905px) and (-webkit-min-device-pixel-ratio: 1.331) and (-webkit-max-device-pixel-ratio: 1.332) {}	

Samsung Galaxy S3

@media only screen and (-webkit-device-pixel-ratio: 2) {}	

Samsung Galaxy S2

@media screen and (device-width: 320px) and (device-height: 533px) and (-webkit-device-pixel-ratio: 1.5) {}	

Galaxy Tab 10.1

/*Landscape*/@media (max-device-width: 1280px) and (orientation: landscape) {}/*Portrait*/@media (max-device-width: 800px) and (orientation: portrait) {}	

iPad In Portrait & Landscape

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

iPad In Landscape

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

iPad In Portrait

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

Retina iPad In Portrait & Landscape

@media only screenand (min-device-width : 768px)and (max-device-width : 1024px)and (-webkit-min-device-pixel-ratio: 2){// CSS Styles}	

Retina iPad in landscape

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

Retina iPad in portrait

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

iPad Mini In Portrait & Landscape

@media only screenand (min-device-width : 768px)and (max-device-width : 1024px)and (-webkit-min-device-pixel-ratio: 1){// CSS Style}	

iPad Mini In Landscape

@media only screenand (min-device-width : 768px)and (max-device-width : 1024px)and (orientation : landscape)and (-webkit-min-device-pixel-ratio: 1){// CSS Style}	

iPad Mini In Portrait

@media only screenand (min-device-width : 768px)and (max-device-width : 1024px)and (orientation : portrait)and (-webkit-min-device-pixel-ratio: 1) {// CSS Style}	

桌面端

320px

@media screen and (max-width: 320px) {}	

640px

@media screen and (max-width: 640px) {}	

800px

@media screen and (max-width: 800px) {}	

1024px

@media screen and (max-width: 1024px) {}	

1028px

@media screen and (max-width: 1028px) {}	

除了上面的常见Media Queries片段之外，下面的网站还提供了一些其他的片段：

框架Media Queries片段

Boilerplate

/*URL:http://html5boilerplate.com/*/	/* Smartphones (portrait and landscape) ----------- */@media only screenand (min-width : 320px)and (max-width : 480px) {/* Styles */}/* Smartphones (landscape) ----------- */@media only screenand (min-width : 321px) {/* Styles */}/* Smartphones (portrait) ----------- */@media only screenand (max-width : 320px) {/* Styles */}/* iPads (portrait and landscape) ----------- */@media only screenand (min-width : 768px)and (max-width : 1024px) {/* Styles */}/* iPads (landscape) ----------- */@media only screenand (min-width : 768px)and (max-width : 1024px)and (orientation : landscape) {/* Styles */}/* iPads (portrait) ----------- */@media only screenand (min-width : 768px)and (max-width : 1024px)and (orientation : portrait) {/* Styles */}/* Desktops and laptops ----------- */@media only screenand (min-width : 1224px) {/* Styles */}/* Large screens ----------- */@media only screenand (min-width : 1824px) {/* Styles */}/* iPhone 4 ----------- */@mediaonly screen and (-webkit-min-device-pixel-ratio : 1.5),only screen and (min-device-pixel-ratio : 1.5) {/* Styles */}	

Bootstrap的Media Queries

/*URL:http://twitter.github.com/bootstrap*/	/* Large desktop */@media (min-width: 1200px) { ... } /* Portrait tablet to landscape and desktop */@media (min-width: 768px) and (max-width: 979px) { ... } /* Landscape phone to portrait tablet */@media (max-width: 767px) { ... } /* Landscape phones and down */@media (max-width: 480px) { ... }	

Foundation的Media Queries

/*URL:http://foundation.zurb.com/*/	/* We use this media query to add styles to any device that supports media queries */@media only screen { }/* Used to alter styles for screens at least 768px wide. This is where the grid changes. */@media only screen and (min-width: 768px) {}/* Used to alter styles for screens at least 1280px wide. */@media only screen and (min-width: 1280px) {}/* Used to alter styles for screens at least 1440px wide. */@media only screen and (min-width: 1440px) {}/* Apply styles to screens in landscape orientation */@media only screen and (orientation: landscape) {}/* Apply styles to screens in portrait orientation */@media only screen and (orientation: portrait) {}	

Skeleton的Media Queries

/*URL:http://www.getskeleton.com*/	/* Smaller than standard 960 (devices and browsers) */@media only screen and (max-width: 959px) {}/* Tablet Portrait size to standard 960 (devices and browsers) */@media only screen and (min-width: 768px) and (max-width: 959px) {}/* All Mobile Sizes (devices and browser) */@media only screen and (max-width: 767px) {}/* Mobile Landscape Size to Tablet Portrait (devices and browsers) */@media only screen and (min-width: 480px) and (max-width: 767px) {}/* Mobile Portrait Size to Mobile Landscape Size (devices and browsers) */@media only screen and (max-width: 479px) {}	

FRAMELESS的Media Queries

/*URL:http://framelessgrid.com/*/@media screen and (max-width: 16.875em){}@media screen and (min-width: 32.5em) and (max-width: 37.4375em),	screen and (min-width: 45em) and (max-width: 56.9375em),	screen and (min-width: 77.5em) and (max-width: 102.4375em),	screen and (min-width: 135em){}@media screen and (min-width: 102.5em) and (max-width: 117.9375em),	screen and (min-width: 150em){}@media screen and (min-width: 15em){}@media screen and (min-width: 30em){}@media screen and (min-width: 37.5em){}@media screen and (min-width: 57em){}@media screen and (min-width: 57em) and (max-width: 117.9375em){}@media screen and (min-width: 118em){}	

Susy的Media Queries

/*URL:http://susy.oddbird.net/*/@media (min-width: 29em) {}@media (min-width: 30em) and (max-width: 60em) {}@media (min-width: 119em) {}@media (min-width: 33.75em) and (max-width: 67.5em) {}@media (min-width: 33.75em) and (max-width: 67.5em) {}	

Less Framework 4

/*URL:http://lessframework.com/*/	@media only screen and (min-width: 768px) and (max-width: 991px) {}/*		Mobile Layout: 320px (20em).		*/@media only screen and (max-width: 767px) {}/*Wide Mobile Layout: 480px (30em)*/@media only screen and (min-width: 480px) and (max-width: 767px) {}	

Golden Grid System的Media Queries

/*URL:http://goldengridsystem.com/*//* @media screen and (min-width: 640px) */@media screen and (min-width: 40em) {}/* @media screen and (min-width: 720px) */@media screen and (min-width: 45em) {}/* @media screen and (min-width: 888px) */@media screen and (min-width: 55.5em) {}/* @media screen and (min-width: 984px) */@media screen and (min-width: 61.5em) {}/* @media screen and (min-width: 1200px) */@media screen and (min-width: 75em) {}/* @media screen and (min-width: 1392px) */@media screen and (min-width: 87em) {}/* @media screen and (min-width: 1680px) */@media screen and (min-width: 105em) {}/* @media screen and (min-width: 1872px) */@media screen and (min-width: 117em) {}/* @media screen and (min-width: 2080px) */@media screen and (min-width: 130em) {}	

Fluid baseline的Media Queries

/*URL:http://fluidbaselinegrid.com/*//* MOBILE PORTRAIT */@media only screen and (min-width: 320px) {}/* MOBILE LANDSCAPE */@media only screen and (min-width: 480px) {}/* SMALL TABLET */@media only screen and (min-width: 600px) {}/* TABLET/NETBOOK */@media only screen and (min-width: 768px) {}/* LANDSCAPE TABLET/NETBOOK/LAPTOP */@media only screen and (min-width: 1024px) {}@media only screen and (min-width: 1280px) {}/* WIDESCREEN *//* Increased body size for legibility */@media only screen and (min-width: 1400px) {}	

320andUP

/*URL:http://stuffandnonsense.co.uk/projects/320andup*/@media only screen and (min-width: 480px) {  /* 480 */}@media only screen and (min-width: 600px) {  /* 600 */}@media only screen and (min-width: 768px) {  /* 768*/}@media only screen and (min-width: 992px) {  /* 992*/}@media only screen and (min-width: 1382px) {  /* 1382 */ }@media only screen and (-webkit-min-device-pixel-ratio: 1.5), only screen and (min--moz-device-pixel-ratio: 1.5), only screen and (min-device-pixel-ratio: 1.5) {  /* 2x*/}	

Gridless

/* URL:http://thatcoolguy.github.com/gridless-boilerplate/ */@media only screen and (min-width: 480px) {	/* Wide mobile (480px+) styles go here */}@media only screen and (min-width: 768px) { 	/* Tablets/netbooks (768px+) styles go here */}@media only screen and (min-width: 1024px) { 	/* Desktops (1024px+) styles go here */}	

TotanTHEMES

/*URL:http://titanthemes.com/*//* Smaller than standard 960 (devices and browsers) */@media only screen and (max-width: 959px) {}/* Tablet Portrait size to standard 960 (devices and browsers) */@media only screen and (min-width: 768px) and (max-width: 989px) {}/* All Mobile Sizes (devices and browser) */@media only screen and (max-width: 767px) {}/* Mobile Landscape Size to Tablet Portrait (devices and browsers) */@media only screen and (min-width: 480px) and (max-width: 767px) {}/* Mobile Portrait Size to Mobile Landscape Size (devices and browsers) */@media only screen and (max-width: 479px) {}	

Responsive Grid System

/*URL:http://responsive.gs/*/	 @media (max-width: 480px) {}  @media (min-width: 480px) and (max-width: 768px) {} @media (min-width: 768px) {}  @media (min-width: 1024px) {}  @media (min-width: 1200px) {}	

本文搜集的是Media Queries在各种设备下的代码片段，希望这些片段能帮大家更好的理解Responsive断点的设置。如果大家有更好的方案，希望能在评论中分享。

2014年04月19日更新

基于视窗宽度的媒体查询断点设置

前提设置body的字体为100%。其具有一个简单的计算公式：100% = 16px = 1em = 14pt

/*Viewport = 1920px*/@media screen and (max-width: 120em){}/*Viewport = 1680px*/@media screen and (max-width: 105em){}/*Viewport = 1400px*/@media screen and (max-width: 87.5em){}/*Viewport = 1200px*/@media screen and (max-width: 75em){}/*Viewport = 1024px*/@media screen and (max-width: 64em){}/*Viewport = 960px*/@media screen and (max-width: 60em){}/*Viewport = 800px*/@media screen and (max-width : 50em){}/*Viewport = 768px*/@media screen and (max-width : 48em){}/*Viewport = 600px*/@media screen and (max-width: 37.5em){}/*Viewport = 480px*/@media screen and (max-width: 30em){}/*Viewport = 320px*/@media screen and (max-width: 20em){}/*Viewport = 240px*/@media screen and (max-width: 15em){}/*	High Resolution/Retina Display Media Queries*//*Pixel Density 3*/@media(-webkit-min-device-pixel-ratio: 3),(min-resolution: 192dpi){}/*Pixel Density 2*/@media(-webkit-min-device-pixel-ratio: 2),(min-resolution: 192dpi){}/*Pixel Density 1.5*/@media(-webkit-min-device-pixel-ratio: 1.5),(min-resolution: 124.8dpi){}/*Pixel Density 1.25*/@media(-webkit-min-device-pixel-ratio: 1.25),(min-resolution: 120dpi){}/*	Printed Style Media Queries*//*Print Resolution 300 dpi*/@media print and (min-resolution: 300dpi){}/*Print Resolution 144 dpi*/@media print and (min-resolution:144dpi){}/*Print Resolution 96 dpi*/@media print and (min-resolution:96dpi){}/*Print Resolution 72 dpi*/@media print and (resolution:72dpi){}

文章出处：http://www.w3cplus.com/css3/media-query-snippets.html