我正在尝试检测移动设备并加载单独的 CSS 文件（如果它是移动设备）。为什么我的代码不起作用？
var isMobile = {
Android: function() {
return navigator.userAgent.match(/Android/i);
},
BlackBerry: function() {
return navigator.userAgent.match(/BlackBerry/i);
},
iOS: function() {
return navigator.userAgent.match(/iPhone|iPad|iPod/i);
},
Opera: function() {
return navigator.userAgent.match(/Opera Mini/i);
},
Windows: function() {
return navigator.userAgent.match(/IEMobile/i);
},
any: function() {
return (isMobile.Android() || isMobile.BlackBerry() || isMobile.iOS() || isMobile.Opera() || isMobile.Windows());
}
};
function getcss(cssfile){
var loadcss = document.createElement('link')
loadcss.rel = "stylesheet"
loadcss.setAttribute("type", "text/css")
loadcss.setAttribute("href", cssfile)
document.getElementsByTagName("head")[0].appendChild(loadcss)
}
if(isMobile.any() == true)
// Defines the resolution range you're targeting (less than 800 pixels wide in this case)
{
getcss('cssclass.css')
// Defines the .css file you want to load for this range (800x600.css)
}
else
{
getcss('css2menuPage.css')
//This else statement has "if" condition. If none of the following criteria are met, load 1280x1024.css
}