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<!DOCTYPE html> <html> <head> <script> function getEventType(event) { document.getElementById("demo").innerHTML = event.type; } </script> </head> <body> <p onmousedown="getEventType(event)"> 单击此段落。 一条消息将告知触发了何种类型的事件。</p> <p id="demo"></p> </body> </html>