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<!DOCTYPE html> <html> <body> <h1>Element 对象</h1> <h2>hasAttribute() 方法</h2> <button id="myBtn" onclick="myFunction()">按钮</button> <p>按钮是否有 onclick 属性：</p> <p id="demo"></p> <script> const myButton = document.getElementById("myBtn"); let answer = myButton.hasAttribute("onclick"); document.getElementById("demo").innerHTML = answer; </script> </body> </html>