根据不同分辨率载入相应CSS样式表

index.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>根据不同分辨率载入相应CSS样式表</title>
<link href="default.css" rel="stylesheet" type="text/css" />
<script>
var loadCss = (function () {
    var arrCss = [{minW: 768, maxW: 1024, src: 'style.css'}, {minW: 0, maxW: 768, src:'css.css'}];
    
    loadCss(arrCss);
    
    bindEvent(window, 'resize', function () {
        loadCss(arrCss);
    });
    
    function loadCss(arr) {
        var w = document.documentElement.clientWidth;
        
        for (var i = 0, len = arr.length; i < len; i++) {
            addCss(arr[i]);
        }
        
        function addCss(json) {
            var arr = document.getElementsByTagName('link');
            var oCss = null;
            var bFlag = false;
            var bAdd = false;
            
            for(var i = 0; i < arr.length; i++) {
                if (arr[i].getAttribute('href') == json.src) {
                    oCss = arr[i];
                    break;
                }
            }
            
            if (w >= json.minW && w <= json.maxW) {
                var css = document.createElement('link');
                css.href = json.src;
                css.rel = 'stylesheet';
                css.type = 'text/css';
                insertAfter(css, arr[arr.length - 1]);
            }
            
            if (oCss) oCss.parentNode.removeChild(oCss);
        }
    }
})();

function bindEvent(obj, events, fn) {
    obj.addEventListener ? obj.addEventListener(events, fn, false) : obj.attachEvent('on' + events, function () { fn.call(obj); });
}

function insertAfter(newElement, targetElement) {  
    var parent = targetElement.parentNode;  
    if (last(parent) == targetElement) parent.insertBefore(newElement);
    else parent.insertBefore(newElement, next(targetElement)); 
}

function next(obj) {
    return obj.nextElementSibling || obj.nextSibling;    
}

function last(obj) {
    return obj.lastElementChild || obj.lastChild;    
}
</script>

</head>

<body>
</body>
</html>

default.css

body { background:black; }

style.css

body { background:red; }

css.css

body { background:green; }

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原文地址：https://www.cnblogs.com/baie/p/3160456.html