动态加载Javascript增强版本

我们经常使用动态加载Javascript,写个函数很容易现实,之前也写过一个函数,不过当加载多个JS时,只能根据浏览器返回的顺序来先后加载,这肯定不是我们想要的,现在使用了一下技巧,当加载多个JS时,能按照我们的顺序加载:

/*

    Name:动态加载JS

    Author:kingwell Leng

    Date : 2013/4/21

    E-mail: jinhua.leng##gmail.com



*/

function getScript(obj, callback) {

    var arr = obj,

    timeout,

    str = typeof obj === 'string';

    function add() {

        var script = document.createElement("script");

            header = document.getElementsByTagName("head")[0];

        script.src = str ? obj : arr[0];

        script.type = "text/javascript";

        if (str) {

            if (script.readyState) {

                script.onreadystatechange = function () {

                    if (script.readyState === 'loaded' || script.readyState === 'complete') {

                        script.onreadystatechange = null;

                        callback && callback();

                    }

                };

            } else {

                script.onload = function () {

                    callback && callback();

                };

            }

        } else {

            if (arr.length >= 1) {

                if (script.readyState) {

                    script.onreadystatechange = function () {

                        if (script.readyState === 'loaded' || script.readyState === 'complete') {

                            script.onreadystatechange = null;

                            arr.shift();

                            timeout = setTimeout(add, 1);

                        }

                    };

                } else {

                    script.onload = function () {

                        arr.shift();

                        timeout = setTimeout(add, 1);

                    };

                }

            } else {

                clearTimeout(timeout);

                callback && callback();

            }

        }

        header.appendChild(script);

    }

    add();

}

 

调用:

getScript(['http://code.jquery.com/jquery-1.9.1.min.js','js1.js', 'js2.js', 'js3.js', 'js4.js'], function () {

	alert('我是按顺序加载啦');

});

 现在是按照我们写代码的顺序加载啦...

 

 

 

 

 

 

 

 

 

 

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