原生事件绑定三种方式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button id="btn1">按钮1</button>
<button id="btn2">按钮2</button>
<button onclick="demo()">按钮3</button>
<script>
const btn1=document.getElementById('btn1')
btn1.addEventListener('click',()=>{
alert('按钮1被点击了')
})
const btn2=document.getElementById('btn2')
btn2.onclick=()=>{
alert('按钮2被点击了')
}
function demo(){
alert('按钮3被点击了')
}
</script>
</body>
</html>