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gradient.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>gradient</title>
<style>
* {
padding: 0;
margin: 0;
}
.bg {
width: 100vw;
height: 100vh;
}
</style>
</head>
<body>
<div class="bg" id="custum-bg"></div>
</body>
<script>
var bg = document.getElementById("custum-bg");
var duration = 100;
var r = 0;
var g = 255;
var b = 0;
var max = 255;
var direction = true;
function changeColor(direction) {
setInterval(() => {
//sample color
// bg.style.backgroundColor = 'rgb(' + r + ',' + g + ',' + b + ')';
//two colors linear gradiens
// bg.style.backgroundImage = "linear-gradient(to right, "+'rgb(' + r + ',' + g + ',' + b + ')' +", "+ 'rgb(' + g + ',' + b + ',' + r + ')'+")";
//three colors linear gradients
bg.style.backgroundImage = "linear-gradient(to right, " + 'rgb(' + r + ',' + g + ',' + b + ')' + ", " + 'rgb(' + g + ',' + b + ',' + r + ')' + ", " + 'rgb(' + r + ',' + b + ',' + g + ')' + ")";
if (direction) {
if (r < max) {
r = r + 1;
g = g - 2;
b = b + 3;
}
}
else {
if (r > max) {
r = r - 3;
g = g + 2;
b = b - 1;
}
}
}, duration);
};
function checkColor() {
if (r < max) {
console.log('less');
changeColor(true);
} else {
max = Math.floor(Math.random() * 255);
changeColor(false);
console.log('more');
}
}
setInterval(() => {
checkColor(r);
}, 1000);
</script>
</html>