<html><head><script>function getEventType(event) { document.getElementById("demo").innerHTML = event.type;}</script></head><body><img src ="/i/eg_planets.jpg" alt="Planets" onmousedown="getEventType(event)" /><p>点击上面的图片，会提示您触发了哪种类型的事件。</p><p id="demo"></p></body></html>