1）scroll事件触发取得scrollTop总是滚动前的位置，不是应该返回滚动后的位置吗？并且scroll会重复触发
2）google ,火狐浏览器 点击上或下滚动箭头后，鼠标再次经过时，也会触发scroll事件，是什么原因造成的？ ie浏览器没有这个问题
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不要用alert，换成console.log看看呢
也许是因为alert中断了执行呢
把alert换成console.log就好