原生JavaScript如何触发滚动条事件?

Question

请问原生JavaScript如何触发滚动条事件，比如判断滚动到顶部，底部，等等？

现在微博中的滚动条滚动到底部后加载更多内容是怎么做的呢？

Answer 1

<script>window.onscroll = function(){var scrollT = document.documentElement.scrollTop||document.body.scrollTop;var scrollH = document.documentElement.scrollHeight||document.body.scrollHeight;var clientH = document.documentElement.clientHeight||document.body.clientHeight//console.log(scrollT +"+"+scrollH+"+"+clientH);if(scrollT == scrollH - clientH){console.log("到底部了");}else if(scrollT == 0){console.log("到顶部了");}} </script>