Node.js Tutorial - Node.js Globals

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Node.js has a few key global variables that are always available to you.

global

JavaScript in web browsers have the window object as a "global" variable.

Any variables or members attached to global are available anywhere in the application.

Node.js has the global object.

Anything attached to it is available anywhere in your node application:

function printit(var_name) {// www. ja v  a2s.  c o m
  console.log(global[var_name]);
}

global.HTML = "H";
global.CSS = "C";

printit("CSS"); 
printit("HTML");
printit("SQL"); 

The code above generates the following result.

console

Node.js has global variable console.

console.log function can output string to the console window or debug window from browser.

console.warn(msg) prints on stderr .

console.time(label) marks a time stamp and console.timeEnd(label) prints out the elapsed time since the time function was called.

console.assert(cond,message ) throws an AssertionFailure exception if cond evaluates to false.

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