如何在JavaScript中为不同的浏览器传递滚动事件

Question

我在我的投资组合网站上的窗口对象上附加了一个滚动事件（我知道这可能会令人皱眉）。当窗口顶部大于指定的y位置[if（window.top> y）]时，我想向标题元素中添加类以缩小元素的尺寸，并“粘贴”至顶部这页纸。将事件作为参数传递给我的函数时，我必须在不同的浏览器（Chrome = {event.path[1].scrollY，Safari = event.target.defaultView.scrollY等）上以不同的方式遍历该事件。我已经编写了检测浏览器的代码，但是，我无法提出一种方法来根据浏览器选择事件的正确路径。

我尝试将数组中的路径保存为字符串，并且根据检测到的浏览器，它将把该字符串作为参数传递。但是，当然这是行不通的。所以这就是我目前所拥有的。

// creates an object called browser to test the behaviors of different browsers.

var Browser = (function () {
    "use strict";
    var Browser = function () {
        this.chrome = function () {
            return !!window.chrome && (!!window.chrome.webstore || !!window.chrome.runtime);
        };
        this.firefox = function () {
            var iT = window.InstallTrigger;
            return typeof iT !== 'undefined';
        };
        this.explorer = function () {
            return !!document.documentMode;
        };
        this.edge = function () {
            return (!!document.documentMode && !!window.StyleMedia);
        };
        this.safari = function () {
            return (/constructor/i).test(window.HTMLElement) || (function (p) {
                return p.toString() === "[object SafariRemoteNotification]";
            })(!window.safari || (typeof safari !== 'undefined' && safari.pushNotification));
        };
    };
    return Browser;
}());

// Creates the browser object and loops through until true is returned.

function detectBrowser() {
    "use strict";
    var b = new Browser(),
        vendor;
    for (vendor in b) {
        if (b[vendor] !== 'undefined') {
            if (b[vendor]()) {
                return vendor;
            }
        }
    }
}

/*-------------------------*/

/* Checks the y position passed in from the event */

function checkPos(e) {
    if (e > 50) {
        if (logo.classList.length === 0) {
            expandHeader();
            checkScroll();
        }
    } else {
        if (logo.classList.length === 1) {
            minimizeHeader();
        }
    }
}

/* Adds scroll event and passes the event through to the next function to check it's y position */

function addEvent() {
    var browser = detectBrowser();
    window.addEventListener("scroll", function (e) {
            var event = e;
            window.requestAnimationFrame(function () {
            checkPos(/* This is where the event will be passed */)
        });
    });
}

addEvent();