变异观察者捕捉无限卷轴

Question

我在facebook上使用此代码

var target = document.querySelector('._38vo');

            // create an observer instance
            var observer = new MutationObserver(function(mutations) {
                console.log(mutations)
                mutations.forEach(function(mutation) {
                    console.log(mutation);
                });
            });

            // pass in the target node, as well as the observer options
            observer.observe(target, {attributes: true, childList: true, characterData: true});

其中._38vo是用户的个人资料。我希望我可以使用它来检测新项目是否已加载。但它没有用，嗯，为什么？