<html><head><script>function show_coords(event) { document.getElementById("demo").innerHTML = "X= " + event.clientX + "<br>Y= " + event.clientY;}</script></head><body><p onmousedown="show_coords(event)">单击此段落可显示鼠标指针的 x 和 y 坐标。</p><p id="demo"></p></body></html>