var firstspan = $('span.activated:first'),
    lastspan = $('span.activated:last');

顺便说一下，如果您使用的是jQuery，那么所有的内嵌点击事件都会发生什么？

By the way, if you're using jQuery, what's with all the inline click events?

您可以添加如下代码：

You could add some code like so:

$('span.place').click(function() {
    activate(); // you can add `this` as a parameter
                // to activate if you need scope.
});