示例
<!DOCTYPE html>
<html>
<head>
<style>
#myid {
width : 250px;
height : 80px;
border : 2px solid blue;
overflow: scroll;
}
</style>
</head>
<body>
<p>Scroll the box.</p>
<div id = "myid" onscroll = "display()">This is demo text. This is demo text. This is demo text. This is demo text. This is demo text. This is demo text.
<br><br></div>
<script>
function display() {
document.getElementById("myid").style.color = "blue";
}
</script>
</body>
</html>
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