CIS 119 Multiple onload handlers

Code

"use strict";
function $(id) { return document.getElementById(id); }

function addInit(func) {
    let onloadFunc = window.onload;
    if (typeof onloadFunc == "function") {
        window.onload = function() {
            if (onloadFunc) onloadFunc();
            func();
        };
    } else {
        window.onload = func;
    }
}

function func1() { $('content').style.backgroundColor = "#ffff00"; }
function func2() { $('content').style.color = "#ff0000"; }
function func3() { $('content').style.fontSize = "24pt"; }
function func4() { $('content').style.fontWeight = "bold"; }
function func5() { $('content').style.textAlign = "center"; }

addInit(func1);
addInit(func2);
addInit(func3);
addInit(func4);
addInit(func5);