如何在点击事件上更新HTML元素？

I am really new at programming, and I am trying to build a random quote machine. The user should be able to get a new random quote upon clicking on a "new quote" button. My problem is that I get a new quote the first time I click on the "new quote" button, but then the quote doesn't change anymore upon subsequent clicking events. Can someone identify where the problem is in my code? I am really new at programming, and I am trying