一页面多XMLHttpRequest对象

    assertEquals(pool.getNumActive(), 3);    
    assertEquals(pool.getNumIdle(), 0);    
    // returnObject object2    
    pool.returnObject(object2);    
    assertFalse(object2.activated);    
    assertEquals(factory.counter, 3);    
    assertEquals(pool.getNumActive(), 2);    
    assertEquals(pool.getNumIdle(), 1);    
    // returnObject object3    
    pool.returnObject(object3);    
    assertFalse(object3.activated);    
    assertEquals(pool.getNumActive(), 1);    
    assertEquals(pool.getNumIdle(), 2);    
    // returnObject object1    
    pool.returnObject(object1);    
    assertFalse(object1.activated);    
    assertEquals(pool.getNumActive(), 0);    
    assertEquals(pool.getNumIdle(), 3);         
    // destroy the pool    
    pool.destroy();    
    assertTrue(object1.destroyed);    
    assertTrue(object2.destroyed);    
    assertTrue(object3.destroyed);    
}