Edit in JSFiddle

// 문서(document)에 onclick 이벤트를 할당한다.
document.onclick = function (e) {

    e = e || window.event;

    var x = 0, y = 0;
    var scroll = scroll();

    if (e.pageX && e.pageY) {
        x = e.pageX;
        y = e.pageY;
    }
    else if (e.clientX && e.clientY) {
        x = e.clientX + scroll.x;
        y = e.clientY + scroll.y;
    }

    function scroll() {

        return {
            x: top.window.scrollX || top.window.pageXOffset || top.document.documentElement.scrollLeft || top.document.body.scrollLeft || 0,
            y: top.window.scrollY || top.window.pageYOffset || top.document.documentElement.scrollTop || top.document.body.scrollTop || 0
        };
    };

    console.log(x);
    console.log(y);
};