css:Media Queries

from: http://www.w3.org/TR/css3-mediaqueries/

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

https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries

https://developer.mozilla.org/en-US/docs/Web/CSS/@media?redirectlocale=en-US&redirectslug=CSS%2F%40media

http://www.javascriptkit.com/dhtmltutors/cssmediaqueries.shtml

<link media="screen and (max-device- 480px)" rel="stylesheet" href="m.css" />
<link media="only screen and (max-device- 480px)" rel="stylesheet" href="m.css" />


<link rel="stylesheet" type="text/css" 
  href="android.css" media="only screen and (max- 480px)" />
<link rel="stylesheet" type="text/css" 
  href="desktop.css" media="screen and (min- 481px)" />

　　iPhones

/* ----------- iPhone 4 and 4S ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 320px) 
  and (max-device- 480px)
  and (-webkit-min-device-pixel-ratio: 2) {

}

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

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

}

/* ----------- iPhone 5 and 5S ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 320px) 
  and (max-device- 568px)
  and (-webkit-min-device-pixel-ratio: 2) {

}

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

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

}

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

/* Portrait and Landscape */
@media only screen 
  and (min-device- 375px) 
  and (max-device- 667px) 
  and (-webkit-min-device-pixel-ratio: 2) { 

}

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

}

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

}

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

/* Portrait and Landscape */
@media only screen 
  and (min-device- 414px) 
  and (max-device- 736px) 
  and (-webkit-min-device-pixel-ratio: 3) { 

}

/* Portrait */
@media only screen 
  and (min-device- 414px) 
  and (max-device- 736px) 
  and (-webkit-min-device-pixel-ratio: 3)
  and (orientation: portrait) { 

}

/* Landscape */
@media only screen 
  and (min-device- 414px) 
  and (max-device- 736px) 
  and (-webkit-min-device-pixel-ratio: 3)
  and (orientation: landscape) { 

}

　　Galaxy Phones

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

/* Portrait and Landscape */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 2) {

}

/* Portrait */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 2) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 2) 
  and (orientation: landscape) {

}

/* ----------- Galaxy S4 ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) {

}

/* Portrait */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: landscape) {

}

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

/* Portrait and Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) {

}

/* Portrait */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: landscape) {

}

　　HTC Phones

/* ----------- HTC One ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) {

}

/* Portrait */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: landscape) {

}

　　Nexus Phones

/* ----------- Nexus 4 ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 384px) 
  and (device-height: 592px) 
  and (-webkit-device-pixel-ratio: 2) {

}

/* Portrait */
@media screen 
  and (device- 384px) 
  and (device-height: 592px) 
  and (-webkit-device-pixel-ratio: 2)
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 384px) 
  and (device-height: 592px) 
  and (-webkit-device-pixel-ratio: 2)
  and (orientation: landscape) {

}

/* ----------- Nexus 5 ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 592px) 
  and (-webkit-device-pixel-ratio: 3) {

}

/* Portrait */
@media screen 
  and (device- 360px) 
  and (device-height: 592px) 
  and (-webkit-device-pixel-ratio: 3)
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 592px) 
  and (-webkit-device-pixel-ratio: 3)
  and (orientation: landscape) {

}

　　iPads

/* ----------- iPad mini ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* Portrait */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: portrait) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: landscape) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* ----------- iPad 1 and 2 ----------- */
/* Portrait and Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* Portrait */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: portrait) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: landscape) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* ----------- iPad 3 and 4 ----------- */
/* Portrait and Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (-webkit-min-device-pixel-ratio: 2) {

}

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

}

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

}

　　Galaxy Tablets

/* ----------- Galaxy Tab 10.1 ----------- */

/* Portrait and Landscape */
@media 
  (min-device- 800px) 
  and (max-device- 1280px) {

}

/* Portrait */
@media 
  (max-device- 800px) 
  and (orientation: portrait) { 

}

/* Landscape */
@media 
  (max-device- 1280px) 
  and (orientation: landscape) { 

}

　　Nexus Tablets

/* ----------- Asus Nexus 7 ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 601px) 
  and (device-height: 906px) 
  and (-webkit-min-device-pixel-ratio: 1.331) 
  and (-webkit-max-device-pixel-ratio: 1.332) {

}

/* Portrait */
@media screen 
  and (device- 601px) 
  and (device-height: 906px) 
  and (-webkit-min-device-pixel-ratio: 1.331) 
  and (-webkit-max-device-pixel-ratio: 1.332) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 601px) 
  and (device-height: 906px) 
  and (-webkit-min-device-pixel-ratio: 1.331) 
  and (-webkit-max-device-pixel-ratio: 1.332) 
  and (orientation: landscape) {

}

　　Kindle Fire

/* ----------- Kindle Fire HD 7" ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 800px) 
  and (max-device- 1280px) 
  and (-webkit-min-device-pixel-ratio: 1.5) {

}

/* Portrait */
@media only screen 
  and (min-device- 800px) 
  and (max-device- 1280px) 
  and (-webkit-min-device-pixel-ratio: 1.5) 
  and (orientation: portrait) {
}

/* Landscape */
@media only screen 
  and (min-device- 800px) 
  and (max-device- 1280px) 
  and (-webkit-min-device-pixel-ratio: 1.5) 
  and (orientation: landscape) {

}

/* ----------- Kindle Fire HD 8.9" ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 1200px) 
  and (max-device- 1600px) 
  and (-webkit-min-device-pixel-ratio: 1.5) {

}

/* Portrait */
@media only screen 
  and (min-device- 1200px) 
  and (max-device- 1600px) 
  and (-webkit-min-device-pixel-ratio: 1.5) 
  and (orientation: portrait) {
}

/* Landscape */
@media only screen 
  and (min-device- 1200px) 
  and (max-device- 1600px) 
  and (-webkit-min-device-pixel-ratio: 1.5) 
  and (orientation: landscape) {

}

　　Laptops

/* ----------- Non-Retina Screens ----------- */
@media screen 
  and (min-device- 1200px) 
  and (max-device- 1600px) 
  and (-webkit-min-device-pixel-ratio: 1) { 
}

/* ----------- Retina Screens ----------- */
@media screen 
  and (min-device- 1200px) 
  and (max-device- 1600px) 
  and (-webkit-min-device-pixel-ratio: 2)
  and (min-resolution: 192dpi) { 
}

　　Apple Watch

/* ----------- Apple Watch ----------- */
@media
  (max-device- 42mm)
  and (min-device- 38mm) { 

}

　　Moto 360 Watch

/* ----------- Moto 360 Watch ----------- */
@media 
  (max-device- 218px)
  and (max-device-height: 281px) { 

}

　　

 

浏览器缓存机制，其实主要就是HTTP协议定义的缓存机制（如： Expires； Cache-control等）。但是也有非HTTP协议定义的缓存机制，如使用HTML Meta 标签，Web开发者可以在HTML页面的<head>节点中加入<meta>标签，代码如下：

<!-- HTTP 1.1 -->
<meta http-equiv="pragma" content="no-cache">
<!-- HTTP 1.0 -->
<meta http-equiv="cache-control" content="no-cache">
<!-- Prevent caching at the proxy server -->
<meta http-equiv="expires" content="0">
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE9" />

　　

<script type="text/javascript">
        var url = window.location.href;
        var u = url.substring(url.indexOf("#") + 1, url.length);
        if (url.indexOf("#") > -1) {
            if (u == "mobile") {
                setCookie("ismobile", "true");
            }
        }
        var browser = {
            versions: function () {
                var u = navigator.userAgent, app = navigator.appVersion;
                return {
                    trident: u.indexOf('Trident') > -1,
                    presto: u.indexOf('Presto') > -1,
                    webKit: u.indexOf('AppleWebKit') > -1,
                    gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1,
                    mobile: !!u.match(/AppleWebKit.*Mobile.*/),
                    ios: !!u.match(/(i[^;]+;( U;)? CPU.+Mac OS X/) && u.indexOf('MiuiBrowser') == -1,
                    android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1 || u.indexOf('MiuiBrowser') > -1,
                    iPhone: u.indexOf('iPhone') > -1 && u.indexOf('MiuiBrowser') == -1,
                    iPad: u.indexOf('iPad') > -1,
                    wp: u.indexOf('IEMobile') > -1 || u.indexOf('Windows Phone') > -1,
                    Nokia:u.indexOf('Symbian')>-1,
                    webApp: u.indexOf('Safari') == -1
                };
            }(),
            language: (navigator.browserLanguage || navigator.language).toLowerCase()
        };

        if (browser.versions.mobile || browser.versions.wp || browser.versions.iPad || browser.versions.iPhone || browser.versions.Nokia) {
            if (getCookie("ismobile") != "true") {
                
                location.replace('http://wap.dusystem.com/');
            }
        }
    </script>