我的jQuery点击事件只能运行一次

I have a set of div's(75px by 75px). Using JQ I"m trying to make it so when you click on the div, it becomes 500px by 500px, and if you click it again it returns to it original size. I can make it big, but it doesn't respond to any further clicks. my latest attempt:I have a set of div's(75px by 75px). Using JQ I