<a href="https://israynotarray.com/" onclick="sayHi(event)">點我</a>
.box {
  color: yellow
}
console.clear()
function sayHi(event) {
  event.preventDefault();
  window.alert('Hello Ray');
}
View Compiled

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.