如题

开发中经常遇到，滚动条滚到底部加载下一页，或者给出提示的需求，也踩过一些坑。

坑的表现：

1）还没到底部，就已经触发了加载下一页的方法(以前遇到过，但是错误的代码已经忘了)

2）多次触发，导致多次调用或者一些异常情况

3）在滚动的时候，偶尔会出现ScrollTop值为空或者undefined的情况

网上的方法不一定奏效的，贴两个原生解决方法：

//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;
}

export var scrollBottom = function () {
    if (getScrollTop() + getWindowHeight() == getScrollHeight()) {
        return true;
    } else {
        return false;
    }
    // let scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
    // let clientHeight = document.documentElement.clientHeight || document.body.clientHeight;
    // let scrollHeight = document.documentElement.scrollHeight || document.body.scrollHeight;
    // if (scrollHeight > clientHeight && scrollTop + clientHeight === scrollHeight) {
    //     return true;
    // } else {
    //     return false;
    // }
};

写在公共util方法里，调用即可。