해결좀

[익명(121.187)]

ReferenceError: $ is not defined at onWindowLoaded (/galaga.js:351:2)

function onWindowLoaded() {

  // screen information

  playArea = $('playarea');

  starField = $('starfield');

  playerScore = $('playerscore');

  WIDTH = playArea.innerWidth();

  HEIGHT = playArea.innerHeight();

  GAME_OBJECTS["missles"] = [];

  setupStars();

  // set into default position

  $(document).bind('keydown', keysDown);

  $(document).bind('keyup', keysUp);

  $(document).ready(pageReady);

}

window.onload = onWindowLoaded;

문제의 구간들