Content description: Modify the color of the div when the button button is clicked
code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
#div1 {
width: 100px;
height: 100px;
border: 1px solid black;
}
.box {
background-color: red;
}
</style>
<script>
function f() {
var Div1 = document.getElementById("div1");
Div1.className = "box";
}
</script>
</head>
<body>
<input type="button" onclick="f()" value="修改div颜色">
<div id="div1"></div>
</body>
</html>Renderings:
Initial image:
click button:
