本文介绍了一种利用JavaScript监听网页滚动位置，并在达到底部时触发Ajax请求加载更多数据的方法。通过实现getDocumentTop(), getWindowHeight() 和 getScrollHeight() 函数，可以准确获取页面滚动的高度，从而判断是否已滚动到页面底部。
//文档高度
function getDocumentTop() {
var scrollTop = 0,
bodyScrollTop = 0,
documentScrollTop = 0;
if(document.body) {
bodyScrollTop = document.body.scrollTop;
}
if(document.documentElement) {
documentScrollTop = document.documentElement.scrollTop;
}
scrollTop = (bodyScrollTop - documentScrollTop > 0) ? bodyScrollTop : documentScrollTop;
return scrollTop;
}
//可视窗口高度
function getWindowHeight() {
var windowHeight = 0;
if (document.compatMode == "CSS1Compat") {
windowHeight = document.documentElement.clientHeight;
} else {
windowHeight = document.body.clientHeight;
}
return windowHeight;
}
//滚动条滚动高度
function getScrollHeight() {
var scrollHeight = 0, bodyScrollHeight = 0, documentScrollHeight = 0;
if (document.body) {
bodyScrollHeight = document.body.scrollHeight;
}
if (document.documentElement) {
documentScrollHeight = document.documentElement.scrollHeight;
}
scrollHeight = (bodyScrollHeight - documentScrollHeight > 0) ? bodyScrollHeight : documentScrollHeight; return scrollHeight;
}
// 最后监听屏幕滚动触发ajax_function()方法请求数据
window.onscroll = function () {
if(getScrollHeight() == getWindowHeight() + getDocumentTop()){
ajax_function()
alert(1);
}
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