动态加载css文件：
function loadStyles(url) {
var link = document.createElement("link");
link.type = "text/css";
link.rel = "stylesheet";
link.href = url;
document.getElementsByTagName("head")[0].appendChild(link);
}
loadStyles("css/secondindex.css");
动态加载js文件：
function loadScript(url) {
var script = document.createElement("script");
script.type = "text/javascript";
script.src = url;
document.body.appendChild(script);
}
loadScript("javascript/lib/cookie.js");
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