当锚点部分改变时，onhashchange事件会触发。您可以尝试运行以下代码来学习如何在JavaScript中实现onhashchange事件。
<!DOCTYPE html>
<html>
<body onhashchange="newFunc">
<button onclick="functionChange()">Click to change anchor</button>
<script>
function functionChange() {
location.hash = "about";
var hash = location.hash;
document.write("The anchor part is now: " + hash);
}
// If the achor part is changed
function newFunc() {
alert("Anchor part changed!");
}
</script>
</body>
</html>
