有些时候我们需要动态的加载一些JS，并在JS加载完成后执行一些回调函数。
var loadscript = {
$$: function (id) {
return document.getElementById(id);
},tag: function (element) {
return document.getElementsByTagName(element);
},ce: function (element) {
return document.createElement(element);
},js: function (url,callback) {
var s = loadscript.ce('script');
s.type = "text/javascript";
s.src = url;
if (document.documentMode == 10 || document.documentMode == 9) {
s.onerror = s.onload = loaded;
} else {
s.onreadystatechange = ready;
s.onerror = s.onload = loaded;
}
loadscript.tag('head')[0].appendChild(s);
function ready() { /*IE7.0/IE10.0*/
if (s.readyState == 'loaded' || s.readyState == 'complete') {
callback();
}
}
function loaded() { /*chrome/IE10.0*/
callback();
}
}
};
//加载百度的uaredirect.js，回调执行uaredirect函数
loadscript.js("http://siteapp.baidu.com/static/webappservice/uaredirect.js",function() {
uaredirect("https://m.baidu.com/");
});
参考网址：
http://www.cnblogs.com/jyk/archive/2013/05/14/3078024.html
http://www.cnblogs.com/w-y-f/p/3469211.html
http://www.xiariboke.com/design/2857.html
