<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>句柄添加监听事件</title> <script type="text/javascript" src="tzy.js"></script> </head> <body> <button id="mybtn" onclick="demo()">按钮</button> <script> /* //注意这种引用样式必须放在button后面不然出现 //Uncaught TypeError: Cannot read property ‘addEventListener‘ of null //错误:页面未加载完成 var x = document.getElementById("mybtn"); x.addEventListener("click", hello); x.addEventListener("click", world);//添加 x.removeEventListener("click", world);//移除 function hello() { alert("hello"); } function world() { alert("world"); }*/ </script> </body> </html>
//注意这种引用样式必须放在button后面不然出现 //Uncaught TypeError: Cannot read property ‘addEventListener‘ of null //错误:页面未加载完成 function demo(){ var x = document.getElementById("mybtn"); x.addEventListener("click", hello); x.addEventListener("click", world);//添加 x.removeEventListener("click", world);//移除 } function hello() { alert("hello"); } function world() { alert("world"); }
时间: 2024-10-12 12:22:48