一页面多XMLHttpRequest对象

        },          

        activateObject: function(object) {    
            object.activated = true;    
        },    

        passivateObject: function(object) {    
            object.activated = false;               
        },    

        destroyObject: function(object) {    
            object.destroyed = true;                
        }    
    };    
    var pool = new ObjectPool(factory);    
    // borrowObject object1    
    var object1 = pool.borrowObject();    
    assertEquals(object1.id, 1);    
    assertTrue(object1.activated);    
    assertEquals(factory.counter, 1);    
    assertEquals(pool.getNumActive(), 1);    
    assertEquals(pool.getNumIdle(), 0);    
    // borrowObject object2    
    var object2 = pool.borrowObject();    
    assertEquals(object2.id, 2);    
    assertTrue(object2.activated);    
    assertEquals(factory.counter, 2);    
    assertEquals(pool.getNumActive(), 2);    
    assertEquals(pool.getNumIdle(), 0);    
    // borrowObject object3    
    var object3 = pool.borrowObject();    
    assertEquals(object3.id, 3);    
    assertTrue(object3.activated);    
    assertEquals(factory.counter, 3);