异步加载js,Css方法

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>Loading Script and Style File</title>
</head>
    <body>
        <div id="out">
        </div>
        <script>
            //加载ok.css
            AsynLoadCss('ok.css','body', function () {
            
            });
            //加载jquery
            AsynLoadJs('jquery-1.7.1.js','body', function () {
                //加载完成后的代码!
                $(document).ready(function () {
                    $("#out").html("加载完成后的代码!");
                });
                
            });
            
        //异步加载js方法
        function AsynLoadJs(src, target, callback) {
            var node = document.createElement('script'),
                    outEl;
            switch (target) {
                case 'body':
                    outEl = document.body;
                    break;
                case 'head':
                    outEl = document.getElementsByTagName('head')[0];
                    break;
                default:
                    outEl = document.getElementsByTagName('head')[0];
            }
            node.type = 'text/javascript';
            if (node.addEventListener) {
                node.addEventListener('load', callback, false);
                node.addEventListener('error', function () {
                    //error function
                }, false);
            }
            else { // for IE6-8
                node.onreadystatechange = function () {
                    var rs = node.readyState;
                    if (rs === 'loaded' || rs === 'complete') {
                        node.onreadystatechange = null;
                        callback();
                    }
                };
            }
            node.src = src;
            outEl.appendChild(node);
        }
        //异步加载Css方法
        function AsynLoadCss(src, target, callback) {
            var node = document.createElement('link'),
                    outEl;
            switch (target) {
                case 'body':
                    outEl = document.body;
                    break;
                case 'head':
                    outEl = document.getElementsByTagName('head')[0];
                    break;
                default:
                    outEl = document.getElementsByTagName('head')[0];
            }
            node.rel = "stylesheet";
            node.type = 'text/css';
            if (node.addEventListener) {
                node.addEventListener('load', callback, false);
                node.addEventListener('error', function () {
                    //error function
                    //callback();
                }, false);
            }
            else { // for IE6-8
                node.onreadystatechange = function () {
                    var rs = node.readyState;
                    if (rs === 'loaded' || rs === 'complete') {
                        node.onreadystatechange = null;
                        callback();
                    }
                };
            }
            node.href = src;
            outEl.appendChild(node);
        }

        </script>
    </body>
</html>

原文地址:https://www.cnblogs.com/lzf0514/p/2721453.html