node和package的区别与联系？
一、package的形式应该是下面任意一种：
a) 包含package.json文件的文件夹
b) 满足a条件的gzip、tar压缩包
c) 指向b的url
d) A @ that is published on the registry with ( c )
e) A @ that points to ( d ).
f) A that has a latest tag satisfying ( e ).
g) A git url that, when cloned, results in ( a ).
A module is any file or directory in the node_modules directory that can be loaded by the Node.js require() function.
二、module的形式应该是下面任意一种：
a) A folder with a package.json file containing a “main” field.
b) A folder with an index.js file in it.
c) A JavaScript file.
小结：一个module是不是package就看其是否拥有package.json文件，
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