判斷終端是ios還是android來加載不同的樣式

<script type="text/javascript">
    var addStyleLink = function(href){
    var head = document.getElementsByTagName('head')[0];
    var styleLink = document.createElement('link');
    styleLink.setAttribute('rel','stylesheet');
    styleLink.setAttribute('href',href);
    head.appendChild(styleLink);
    }
     
    // 蘋果手機采用CSS1
    if(/iphone/i.test(navigator.userAgent)){
        addStyleLink('css/css1.css');   //這里路徑要寫對
    }

    // 安卓手機采用CSS2
    if(/android/i.test(navigator.userAgent)){
        addStyleLink('css/css2.css');
    }
</script>