我们可以使用PHP检测客户端的操作系统吗，它是移动，Android或Windows来显示网站的设计响应。
我用过，
.CSS
@media screen and (min-width: 1200px) {
/*
Detected PC.
*/
}
@media screen and (min-width: 500px) {
/*
Detected Mobile or PC.
*/
}
但是我不想在同一页面中编写两个CSS，而是想用PHP加载它们
.PHP
<?php
$is_pc = ???; //Don't know what to write.
if ($is_pc) {
echo '<link href="pc.css" rel="stylesheet">';
} else {
echo '<link href="mobile.css" rel="stylesheet">';
}
?>
不好的做法和主要的做法，但远非只有一个，是：
如果您选择 witch CSS 来加载服务器端，您将无法在平板电脑上处理垂直和水平模式之间的切换（hz = 桌面视图;vt = 移动视图），因为您将无法重新加载页面。
这就是为什么您应该同时在 CSS 中加载这两个媒体查询的原因。
如果要执行相同的行为，请使用以下命令：
<link rel="stylesheet" media="screen and (max-width: 768px)" href="mobile.css" />
<link rel="stylesheet" media="screen and (min-width: 768px)" href="pc.css" />
我得到了答案。
经过对HTTP_USER_AGENT的长期研究.
我得到了这个：
.PHP
<?php
$useragent=$_SERVER['HTTP_USER_AGENT'];
if(!preg_match('/(android|bb'd+|meego).+mobile|avantgo|bada'/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)'/|plucker|pocket|psp|series(4|6)0|symbian|treo|up'.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i',$useragent)||preg_match('/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s'-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|'-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw'-(n|u)|c55'/|capi|ccwa|cdm'-|cell|chtm|cldc|cmd'-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc'-s|devi|dica|dmob|do(c|p)o|ds(12|'-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly('-|_)|g1 u|g560|gene|gf'-5|g'-mo|go('.w|od)|gr(ad|un)|haie|hcit|hd'-(m|p|t)|hei'-|hi(pt|ta)|hp( i|ip)|hs'-c|ht(c('-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i'-(20|go|ma)|i230|iac( |'-|'/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |'/)|klon|kpt |kwc'-|kyo(c|k)|le(no|xi)|lg( g|'/(k|l|u)|50|54|'-[a-w])|libw|lynx|m1'-w|m3ga|m50'/|ma(te|ui|xo)|mc(01|21|ca)|m'-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t('-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)'-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|'-([1-8]|c))|phil|pire|pl(ay|uc)|pn'-2|po(ck|rt|se)|prox|psio|pt'-g|qa'-a|qc(07|12|21|32|60|'-[2-7]|i'-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55'/|sa(ge|ma|mm|ms|ny|va)|sc(01|h'-|oo|p'-)|sdk'/|se(c('-|0|1)|47|mc|nd|ri)|sgh'-|shar|sie('-|m)|sk'-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h'-|v'-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl'-|tdg'-|tel(i|m)|tim'-|t'-mo|to(pl|sh)|ts(70|m'-|m3|m5)|tx'-9|up('.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|'-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c('-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas'-|your|zeto|zte'-/i',substr($useragent,0,4))) {
echo '<link href="pc.css" rel="stylesheet">';
} else {
echo '<link href="mobile.css" rel="stylesheet">';
}
?>
我的建议是使用javascript中的客户端。第一个需求是检测客户端窗口的方法.mobileAndTabletcheck（）
window.mobileAndTabletcheck = function() {
var check = false;
(function(a){if(/(android|bb'd+|meego).+mobile|avantgo|bada'/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)'/|plucker|pocket|psp|series(4|6)0|symbian|treo|up'.(browser|link)|vodafone|wap|windows ce|xda|xiino|android|ipad|playbook|silk/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s'-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|'-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw'-(n|u)|c55'/|capi|ccwa|cdm'-|cell|chtm|cldc|cmd'-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc'-s|devi|dica|dmob|do(c|p)o|ds(12|'-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly('-|_)|g1 u|g560|gene|gf'-5|g'-mo|go('.w|od)|gr(ad|un)|haie|hcit|hd'-(m|p|t)|hei'-|hi(pt|ta)|hp( i|ip)|hs'-c|ht(c('-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i'-(20|go|ma)|i230|iac( |'-|'/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |'/)|klon|kpt |kwc'-|kyo(c|k)|le(no|xi)|lg( g|'/(k|l|u)|50|54|'-[a-w])|libw|lynx|m1'-w|m3ga|m50'/|ma(te|ui|xo)|mc(01|21|ca)|m'-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t('-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)'-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|'-([1-8]|c))|phil|pire|pl(ay|uc)|pn'-2|po(ck|rt|se)|prox|psio|pt'-g|qa'-a|qc(07|12|21|32|60|'-[2-7]|i'-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55'/|sa(ge|ma|mm|ms|ny|va)|sc(01|h'-|oo|p'-)|sdk'/|se(c('-|0|1)|47|mc|nd|ri)|sgh'-|shar|sie('-|m)|sk'-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h'-|v'-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl'-|tdg'-|tel(i|m)|tim'-|t'-mo|to(pl|sh)|ts(70|m'-|m3|m5)|tx'-9|up('.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|'-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c('-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas'-|your|zeto|zte'-/i.test(a.substr(0,4)))check = true})(navigator.userAgent||navigator.vendor||window.opera);
return check;}
接下来，你需要说，ajax 用于阅读样式，加载 CSS（文件，回调）
function loadCSS(file,CallBack){
var xmlhttp=new XMLHttpRequest();
var ts = "?"+new Date().getTime();// use timestamp for prevent caching
xmlhttp.open('GET', file+ts,true);
xmlhttp.onload=function(){
if(xmlhttp.readyState==4 && xmlhttp.status==200){
var style=document.createElement("style");
style.innerHTML=xmlhttp.responseText;
document.head.appendChild(style);
CallBack();
};
};
xmlhttp.send();};
最后你得到了
if(window.mobileAndTabletcheck()){
loadCSS("mobile.css",function(){console.log('loaded mobile');});}else{
loadCSS("pc.css",function(){console.log('loaded pc');});}
在 head 标签中，您将加载样式。