浏览器处于安全策略考虑，只允许Javascript关闭由javascript打开的页面，为了用js关闭当前窗口，我们可以这么考虑，这也是最常用的做法。
<a href="javascript:;" onclick='xx()'>fdsafas</a>
function xx(){// 重置window.opener用来获取打开当前窗口的窗口引用// 这里置为null,避免IE下弹出关闭页面确认框window.opener = null;// JS重写当前页面window.open("", "_self", "");// 顺理成章的关闭当前被重写的窗口window.close();}
stackoverflow上老外的原文解释：
For security reasons, a window can only be closed in JavaScript if it was opened by JavaScript. In order to close the window, you must open a new window with_selfas the target, which will overwrite your current window, and then close that one (which you can do since it was opened via JavaScript).
也附上另外一种解决思路：
window.open('javascript:window.open("", "_self", "");window.close();', '_self');
内嵌的javascript:window.open("", "_self", "");是为了防止IE弹出确认关闭框，等于重置window.opener
FireFox内置支持window.close，但是由于本身的设定，不允许JS自行关闭窗口，所以需要用户手动修改about:config下的dom.allow_scripts_to_close_windows的值为true，再按照上述思路解决问题。
很多情况下用户不会手动去修改FireFox的设置，这里也有个折中的办法，在将"close"的行为变化为"location.href"跳转，仅针对FireFox
function xx(){location.href = "about:blank";}
综上，JS部分可以修改如下：
var xx = navigator.userAgent.indexOf("Firefox") > -1 ? function(){location.href = "about:blank";}:function(){window.opener = null;window.open("", "_self", "");window.close();};
