<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>Document</title> </head> <body> <button id="action-btn">123</button> <script> function addListener(target, type, handler) { if (target.addEventListener) { target.addEventListener(type, handler, false); } else if (target.attachEvent) { target.attachEvent("on" + type, handler); } else { target["on" + type] = handler; } } function doSomething() { //代码 console.log("show"); } var btn = document.getElementById("action-btn"); addListener(btn, "click", doSomething); </script> </body> </html>