getElementById Function on Node.js

I'm trying to build a node.js app and I just tried to insert a getElementById function inside window.onload. When I intend to make node index.js it produce an error on the terminal

/Users/erhanyasar/Documents/Web/www/arete/HR/node/index.js:30
    var myResume = document.getElementById('myResume'); \
                                            ^^^^^^^^
SyntaxError: Unexpected identifier
    at createScript (vm.js:53:10)
    at Object.runInThisContext (vm.js:95:10)
    at Module._compile (module.js:543:28)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:423:7)
    at startup (bootstrap_node.js:147:9)

Is that not working on node to define elements server-side? I couldn't find a proper example with the same error.

Tx,

via Erhan Yaşar