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<!DOCTYPE html> <html> <body> <p>此示例使用 addEventListener() 方法将“mousedown”和“mouseup”事件附加到 p 元素。</p> <p id="demo">点击我。</p> <script> document.getElementById("demo").addEventListener("mousedown", mouseDown); document.getElementById("demo").addEventListener("mouseup", mouseUp); function mouseDown() { document.getElementById("demo").innerHTML = "按住鼠标键。"; } function mouseUp() { document.getElementById("demo").innerHTML = "您释放了鼠标按钮。"; } </script> </body> </html>