延迟加载css和javascript

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="cn">
<head>
        <meta http-equiv="Content-Type" content="text/html;charset=gbk">
        <title>动态加载脚本和动态加载样式</title>
</head>
<body>
        <script type="text/javascript">
                //动态加载脚本
                var script=document.createElement('script');
                script.type="text/javascript",
                script.src="client.js";
                document.body.appendChild(script);
                //封装方法追加方法url
                function loadScript(url){
                        var script=document.createElement('script');
                        script.type="text/javascript",
                        script.src=url;
                        document.body.appendChild(script);                
                }
                loadScript('gaolu.js')
                //封装方法追加方法text
                function loadScriptScript(code){
                        var script=document.createElement('script');
                        script.type="text/javascript";
                        try{
                                script.appendChild(document.creatTextNode(code));
                        }catch(ex){
                                script.text=code;
                        }
                        document.body.appendChild(script);                
                }                
                loadScriptScript('function say(){alert("11");};say();');
                
                //动态加载样式
                var link=document.createElement('link');
                link.type="text/css";
                link.rel="stylesheet";
                link.href="style.css";
                var head=document.getElementsByTagName('head')[0];
                head.appendChild(link);
                //封装方法追加方法href
                function loadStyles(href){
                        var link=document.createElement('link');
                        link.type="text/css";
                        link.rel="stylesheet";
                        link.href=href;
                        var head=document.getElementsByTagName('head')[0];
                        head.appendChild(link);                        
                }
                loadStyles('css.css');
                //封装方法追加方法text
                function loadStyleString(css){
                        var style=document.createElement('style');
                        style.type='text/css';
                        try{
                                style.appendChild(document.createTextNode(css));
                        }catch (ex){
                                style.styleSheet.cssText=css;
                        }
                        var head=document.getElementsByTagName('head')[0];
                        head.appendChild(style);
                }
               // loadStyleString('body{background-color:red;}')
        </script>
</body>
</html>
延迟加载css和javascript

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