define(    function () {    if (typeof window == "undefined")return {        load: function (n, r, load) {            load()        }    };    var head = document.getElementsByTagName("head")[0];    var engine = window.navigator.userAgent.match(/Trident\/([^ ;]*)|AppleWebKit\/([^ ;]*)|Opera\/([^ ;]*)|rv\:([^ ;]*)(.*?)Gecko\/([^ ;]*)|MSIE\s([^ ;]*)/) || 0;    var useImportLoad = false;    var useOnload = true;    if (engine[1] || engine[7])useImportLoad = parseInt(engine[1]) < 6 || parseInt(engine[7]) <= 9; else if (engine[2])useOnload = false; else if (engine[4])useImportLoad = parseInt(engine[4]) < 18;    var cssAPI = {};    cssAPI.pluginBuilder = "./css-builder";    var curStyle;    var createStyle = function () {        curStyle = document.createElement("style");        head.appendChild(curStyle)    };    var importLoad = function (url, callback) {        createStyle();        var curSheet = curStyle.styleSheet || curStyle.sheet;        if (curSheet && curSheet.addImport) {            curSheet.addImport(url);            curStyle.onload = callback        } else {            curStyle.textContent = ‘@import "‘ + url + ‘";‘;            var loadInterval = setInterval(function () {                try {                    curStyle.sheet.cssRules;                    clearInterval(loadInterval);                    callback()                } catch (e) {                }            }, 10)        }    };    var linkLoad = function (url, callback) {        var link = document.createElement("link");        link.type = "text/css";        link.rel = "stylesheet";        if (useOnload)link.onload = function () {            link.onload = function () {            };            setTimeout(callback, 7)        }; else var loadInterval = setInterval(function () {            for (var i = 0; i < document.styleSheets.length; i++) {                var sheet = document.styleSheets[i];                if (sheet.href =http://www.mamicode.com/= link.href) {                    clearInterval(loadInterval);                    return callback()                }            }        }, 10);        link.href = url;        head.appendChild(link)    };    cssAPI.normalize = function (name, normalize) {        if (name.substr(name.length - 4, 4) == ".css")name = name.substr(0, name.length - 4);        return normalize(name)    };    cssAPI.load = function (cssId, req, load, config) {        (useImportLoad ? importLoad : linkLoad)(req.toUrl(cssId + ".css"), load)    };    return cssAPI});