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33.random.html
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33.random.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box {
width: 200px;
height: 200px;
background-color: rgb(42, 112, 153);
}
</style>
</head>
<body>
<div class="box">box</div>
<script src="https://code.jquery.com/jquery-3.6.0.js"
integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
<script>
//可亂數取得0-0.999999之間的數字
const myRandom = Math.random()
console.log('random:', myRandom);
console.log('random:', myRandom * 100);
//RGB <256內的整數
console.log('random:', Math.floor(myRandom * 256));
function getRandomInt() {
const myRandom = Math.random()
return Math.floor(myRandom * 256)
}
console.log('getRandomInt :', getRandomInt());
//rgb=(256,256,256)
$('.box').css('background-color', `rgb(${getRandomInt()},${getRandomInt()},${getRandomInt()})`)
</script>
</body>
</html>