In my opinion, i was diong my final program of Web class. At that time i was coding a web page which was using as a to do list. I was program the background logic that i used node.js and jquery. Then there was a bug that my page can't jump to the new page. So i need to find where had the fault. Then i find my logic fault. my router's name were not mach the fount's name so it can't jump. And this name was not mach on a chapter word. it's so difficult to find that waste my lot's of time.