let physicsManager = cc.director.getPhysicsManager();
physicsManager.enabled = true;

physicsManager.debugDrawFlags = 
    0;
    // cc.PhysicsManager.DrawBits.e_aabbBit |
    // cc.PhysicsManager.DrawBits.e_pairBit |
    // cc.PhysicsManager.DrawBits.e_centerOfMassBit |
    // cc.PhysicsManager.DrawBits.e_jointBit |
    // cc.PhysicsManager.DrawBits.e_shapeBit
    // ;
