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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <p>单击按钮以查看按钮元素是否具有 onclick 属性。</p> <button id="myBtn" onclick="myFunction()">试一试</button> <p>Internet Explorer 8 及更早版本不支持 hasAttribute() 方法。</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myBtn").hasAttribute("onclick"); document.getElementById("demo").innerHTML = x; } </script> </body> </html>