cc.Class({
  extends: cc.Component,
  properties: {},
  onLoad: function () {},
  start: function () {
    this.onActivatePhysicsWorld();
  },
  onActivatePhysicsWorld: function () {
    var e = cc.director.getPhysicsManager();
    e.enabled = true;
    e.gravity = cc.v2(0, -2e3);
  },
  onActivateCollisionWorld: function () {
    cc.director.getCollisionManager().enabled = true;
  }
});