Changes

|[https://github.com/cyh0968 @cyh0968] - Yohan Choi

|#1 https://github.com/nchand/BarCodeGenerator/issues/1 <br>#2 https://github.com/Swap76/Learn-JavaScript/issues/23 <br>#3 https://github.com/Swap76/Learn-JavaScript/issues/263 <br>#4 https://github.com/Swap76/Learn-JavaScript/issues/271

|#1 https://ychoi63.blogspot.com/2019/10/osd600-lab04-first-pull-request.html <br>#2 https://ychoi63.blogspot.com/2019/10/the-second-pull-request.html<br>#3 <br>#4

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