js手機端和pc端加載不同的樣式

function loadCSS() {
if((navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|wOSBrowser|BrowserNG|WebOS)/i))) {
document.write('<link href="shouji.css" rel="stylesheet" type="text/css" media="screen" />');
}
else {
document.write('<link href="pc.css" rel="stylesheet" type="text/css" media="screen" />');
}
}
loadCSS();