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javascript.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!-- scriptは上から順に実行 -->
<!-- <script>
location.href = "https://google.com";
</script> -->
<script>
str = "3";
num = Number(str);
num = 2*num;
console.log(num);
</script>
<script>
for(let i=1; i<11; i++) {
if(i % 2 == 0) {
console.log(i);
}
}
</script>
<script>
let fruits = ["りんご", "バナナ", "オレンジ", "ぶどう"];
for( let i=0; i<fruits.length; i++) {
console.log(fruits[i]);
}
</script>
<script>
function square(x){
return x*x
}
console.log(square(3));
</script>
<script>
function Dog(){
this.name;
this.age;
}
Dog.prototype.bark = function(){
console.log(`${this.name}(${this.age})：ワン！`);
}
var kota = new Dog();
kota.name = "kota";
kota.age = 6;
kota.bark()
</script>
</head>
<body>
<h1>このページへようこそ！</h1>
<div id="container">
</div>
<div>
<h2>得点: <span id="score">0</span>点</h2>
<button id="addButton">加点(+10点)</button>
<button id="subtractButton">減点(-5点)</button>
<button id="resetButton">リセット</button>
</div>
<div>
<div id="countdown">10</div>
<button id="countBtn">開始</button>
</div>
<script>
const countdownElement = document.getElementById("countdown");
const countBtn = document.getElementById("countBtn");
countBtn.addEventListener('click', () => {
let count = 10;
const intervalId = setInterval(() => {
count -= 1;
if (count === 0) {
countdownElement.textContent = "Time's up!";
clearInterval(intervalId);
} else {
countdownElement.textContent = count;
}
}, 1000);
})
let score = 0;
const scoreElement = document.getElementById("score");
function UpdateScore(){
scoreElement.textContent = score;
}
const addButton = document.getElementById("addButton");
addButton.addEventListener('click', () => {
score += 10;
UpdateScore();
})
const subtractButton = document.getElementById("subtractButton");
subtractButton.addEventListener('click', () => {
score -= 5;
UpdateScore();
})
const resetButton = document.getElementById("resetButton");
resetButton.addEventListener('click', () => {
score = 0;
UpdateScore();
})
</script>
</body>
</html>