Event Handler

var x = document.getElementById("myBtn");

if (x.addEventListener) { // For all major browsers, except IE 8 and earlier
x.addEventListener("click", myFunction);
} else if (x.attachEvent) { // For IE 8 and earlier versions
x.attachEvent("onclick", myFunction);
}

document.getElementById("myDiv").addEventListener("click", myFunction, true); //이벤트 추가

element.removeEventListener("mousemove", myFunction); //이벤트 삭제

브라우저 크기 알아 내기

var w=window.innerWidth
|| document.documentElement.clientWidth
|| document.body.clientWidth;

var h=window.innerHeight
|| document.documentElement.clientHeight
|| document.body.clientHeight;