@writ/utils/get-page-height.js

My tool kit

'use strict';
// 获取页面高度
export default function getPageHeight() {
    var g = document,
        a = g.body,
        f = g.documentElement,
        d = g.compatMode == "BackCompat" ? a : g.documentElement;

    return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight);
}