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js08_functionArrow.html
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js08_functionArrow.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button id="btn">Click Me!</button>
<p id="demo"></p>
<script>
var hello;
hello = function () {
document.getElementById("demo").innerHTML = "test";
}
//The window object cal ls the function:
//이 로직이 브라우저 내부의 js엔진(인터프리터)이 실행 핧 경우 콜백으로 등록
//load되는 시점 : body end tag가 실행된 직후에 hello라는 변수가 보유식을 실행하는 콜백함수 등록 문법
// window.addEventListener("load", hello);
//? hello 호출 말고 익명 함수 구현 문법으로 두번째 parameter에 적용
window.addEventListener("load", function(){document.getElementById("demo").innerHTML="으엑";});
//A button object calls the function:
//hello라는 함수 기능을 보유한 변수를 이벤트 콜백으로 등록
//client가 버튼 click할때 자동 실행되게 구현한 이벤트 콜백함수
document.getElementById("btn").addEventListener("click", hello);
</script>
<br><hr><br>
<button onclick="hello2()">눌러주세엽</button>
<script>
function hello2(){
document.getElementById("demo").innerHTML = "이벤트 처리함수, 직접 호출";
}
</script>
</body>
</html>
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