摘要：
load:loads a source file every time it is called.每次加载文件的时候都调用require: loads a source file only once.第一次加载文件的时候调用include: includes modules,nothing to do with files.加载modules时用，与文件无关.chomp: removes any line ending ("\n", "\r", "\r\n")chop: would remove ANY final character 阅读全文