Click event listener works in Safari in OSX but not in iOS

I'm making a web app and I want to click on an element and handle the click in one long click event handler. I'm testing in Safari. The following works fine in Safari on my Mac but not in iOS:

<html>
    <head>
        <script>
            window.addEventListener("click",function (event) {
                alert('hi');
            });
        </script>
    </head>
    <body>
        <div style="width: 100%; height: 100%; background: black;">
        </div>
    </body>
</html>

Why does this work in the OSX version of Safari but not in iOS?

This code should work cross-browser:

function Subscribe(event, element, func) {
    if (element.addEventListener) {
        element.addEventListener(event, func, false);
    } else if (element.attachEvent) {
        element.attachEvent("on" + event, func);
    } else {
        element['on' + event] = func;
    }
}

function func () {
    alert('hi');
}

Subscribe('click', window, func);

Try changing the event listener "click" to "click touchstart"

I found a very simple solution. I put another div about the div element in my sample code (see my question above). The opening div tag is