const cars = ["Saab", "Volvo", "BMW"];
cars[0] = "Opel";
let index = cars.indexOf("Volvo");
const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.pop();
fruits.push("Kiwi");
var students = ['김xx', '최xx', '박xx', '이xx']
students[Math.floor(Math.random()*students.length)]
let a = Math.floor(0.60); > 0
let d = Math.floor(5.1); > 5
let e = Math.floor(-5.1); > -6
let f = Math.floor(-5.9); > -6
Html문서에 자바스크립트 코드 포함
<!DOCTYPE html>
<html>
<body>
<p id="my_text" class="content"></p>
<script>
var element1 = document.getElementById("my_text");
var element2 = document.getElementsByTagName("p");
var element3 = document.getElementsByClassName("content");
console.log(element1);
console.log(element2);
console.log(element3);
</script>
</body>
</html>
> 크롬 console 결과
<p id="my_text" class="content"></p>
HTMLCollection(1)
HTMLCollection(1)
<!DOCTYPE html>
<html>
<head><title>7-2</title></head>
<body>
<p id="my_text" class="content"></p>
<script>
var element = document.getElementById("my_text");
var name = prompt("이름을 입력하세요");
document.innerText = name + "님, 안녕하세요."
</script>
</body>
</html>