web页面背景色控制

时间:2025-01-06 12:03:26

有一道题要实现输入rgb数值,实现更换页面背景色的功能,如下图所示:

web页面背景色控制

答案:

<html>
<head>
<script type="text/javascript">
window.onload=function(){
var change = document.getElementById("change");
change.onclick = function(){
var r = document.getElementById("r").value;
var g = document.getElementById("g").value;
var b = document.getElementById("b").value;
document.body.style.backgroundColor = "rgb("+r+","+g+","+b+")";
}
}
</script>
</head>
<body>
r: <input type="text" id="r" value="123"/><br>
g: <input type="text" id="g" value="123"/><br>
b: <input type="text" id="b" value="123"/><br>
<button id="change">change</button
</body>
</html>