getMonth（） 调用返回0到11之间的值，其中0是1月，11是12月，因此10表示11月。在字符串中使用该值时，需要将其值增加1。如果仅将其输出为字符串，则会看到它具有正确的日期。注意我还必须更改开始日期格式。它似乎不喜欢 2011-11-11 ，所以我做到了 11/11/2011 。 http://jsfiddle.net/9HLSW/

The getMonth() call returns a value between 0 and 11, where 0 is January and 11 is December, so 10 means November. You need to increment the value by 1 when using it in a string. If you simply output it as a string you'll see that it has the correct date. Note I also had to change the starting date format. It didn't seem to like 2011-11-11 so I made it 11/11/2011. http://jsfiddle.net/9HLSW/