IE浏览器中无法获取window.location.origin的解决方法

var origin = window.location.origin;
//判断orgin是否为undefined,如果是undefined则进行拼接
if (typeof (origin) == "undefined") {
origin = window.location.protocol + "//" + window.location.hostname + (window.location.port ? ':' + window.location.port : '');
}