Link: http://imanas.shanghai.nyu.edu/~zy1193/week4/walking.html
When I was doing this exercise, there is a careless mistake I made that I give a name to the var but I put it outside the function{ }, which means it’s not globally, but I still use that given name, so it doesn’t work at all.
I also feel like the javascript is a little different from the HTML and CSS, which need a strong sense of logic and a clear understanding of every component on your page.