javascript - node.js全局变量？(node.js global variables?)

Question

I asked here: node.js require inheritance?(我在这里问： node.js是否需要继承？)

and was told that I can set variables to the global scope by leaving out the var.(有人告诉我可以通过省略var将变量设置为全局范围。) This does not work for me.(这对我不起作用。) ie:(即：) _ = require('underscore'); Does not make the _ available on required files.(不能使_在必需文件上可用。) I can set with express's app.set and have it available elsewhere though.(我可以使用express的app.set进行设置，但是可以在其他地方使用。) Can somebody confirm that this is supposed to work?(有人可以确认这应该起作用吗？) Thanks.(谢谢。)   ask by Harry translate from so