st hw01 —— A exprience of software testing

Last time when I first used node.js to do a project, I download several modules,such as epress module
and mysql module, when I download the mysql module, I used the way of Global Installation, so when I
change another computer, it didn't work, it point out can't find mysql module.
The reason was I downloaded the mysql modules using the way of Global Installation, the impact is
the project didn't work, it took me 2 hours to find out the problem, I checked the modules I had downloaded
and didn't find mysql module, so I downloaded the mysql module again, then it works out.