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<!DOCTYPE html> <html> <body> <h1>Event timeStamp</h1> <p>单击按钮以获取从该文档加载到单击按钮的毫秒数。</p> <button onclick="myFunction(event)">单击我！</button> <p>自加载此文档以来的时间：<span id="demo"></span></p> <script> function myFunction(event) { var n = event.timeStamp; document.getElementById("demo").innerHTML = n; } </script> </body> </html>