判断是否滚动到底部

//滚动条在Y轴上的滚动距离
function getScrollTop() {
    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;
}

//文档的总高度
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;
}

//浏览器视口的高度
function getWindowHeight() {
    var windowHeight = 0;
    if (document.compatMode == "CSS1Compat") {
        windowHeight = document.documentElement.clientHeight;
    } else {
        windowHeight = document.body.clientHeight;
    }
    return windowHeight;
}
//判断是否滚动到底部
function isBottom(distance) {
    let bottomDistance = distance || 0;
    if (getScrollTop() + getWindowHeight() + bottomDistance >= getScrollHeight()) {
        //console.log("已经到底部");
        return true;
    } else {
        return false;
    }
};

export { isBottom }

//引用 import {isBottom} from './isBottom.js'

//滚动加载使用
//vue中生命周期mounted执行
window.addEventListener('scroll', this.loadMore) //this.loadMore为滚动加载的方法
//移除监听
//vue中生命周期beforeDestroy执行
window.removeEventListener('scroll', this.loadMore)

欢迎前端小伙伴加群一起学习进步：163958730