双恒 在JavaScript中，onscroll事件的用途是什么？
当元素的滚动条被滚动时，会触发onscroll事件。您可以尝试运行以下代码来了解如何在JavaScript中实现onscroll 事件。
示例
<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 2px solid blue;
width: 300px;
height: 100px;
overflow: scroll;
}
</style>
</head>
<body>
<div id=content>
This is demo text. This is demo text.This is demo text.This is demo text.
This is demo text.This is demo text.This is demo text.This is demo text.
This is demo text.This is demo text.This is demo text.
This is demo text.This is demo text.This is demo text.
This is demo text.This is demo text.This is demo text.
</div>
<p id = myScroll> </p>
<script>
document.getElementById(content).onscroll = function() {myFunction()};
function myFunction() {
document.getElementById(myScroll).innerHTML = Scroll successfull!.;
}
</script>
</body>
</html>
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