滚动屏幕至最下方触发事件源码分享

//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);

}

原创文章链接：http://www.zhicaipt.cn/hz_index/view/article_detail.html?id=42