javascript:页面中有多处window.onload时的处理(chrome 105.0.5195.125)

一，js代码:

<html>
<head>
    <meta charset="utf-8"/>
    <title>测试</title>
</head>
<body>
<script>
//console.log("window.onload未执行前的值:"+window.onload);
//console.log("window.onload未执行前的类型:"+typeof(window.onload));

//第一处onload
window.onload = function() {
    console.log('window.onload1');
}
//console.log("window.onload第一次执行过后的值:"+window.onload);
//console.log("window.onload第一次执行过后的类型:"+typeof(window.onload));
//第二处onload
window.onload = function() {
    console.log('window.onload2');
}
//console.log("window.onload第二次执行过后的值:"+window.onload);
//console.log("window.onload第二次执行过后的类型:"+typeof(window.onload));
//加载函数到window.onload
function addLoadEvent(myOnload) {
                var oldOnload = window.onload;
                console.log("window.onload当前的值:");
                console.log(oldOnload);
                console.log("window.onload当前的类型:"+typeof(window.onload));
                if (typeof window.onload != 'function') {
                    window.onload = myOnload;
                } else {
                    window.onload = function() {
                        oldOnload();
                        myOnload();
                    }
                }
}

//函数
function onload1() {
     console.log('function onload1');
}
//函数
function onload2() {
     console.log('function onload2');
}
//调用
addLoadEvent(onload1);
//调用
addLoadEvent(onload2);

</script>
</body>
</html>