如何使用JavaScript设置背景的绘画区域？
要使用JavaScript设置背景的绘画区域，请使用backgroundClip属性。您可以尝试运行以下代码来设置背景的绘画区域-
示例
<!DOCTYPE html>
<html>
<head>
<style>
#box {
border: 2px dashed green;
padding: 35px;
width: 600px;
height: 400px;
background-color: blue;
background-clip: border-box;
}
</style>
</head>
<body>
<button onclick="display()">Set painting area</button>
<div id="box">
This is Demo Text! This is Demo Text! This is Demo Text!
This is Demo Text! This is Demo Text!
</div>
<script>
function display() {
document.getElementById("box").style.backgroundClip = "content-box";
}
</script>
</body>
</html>