Javascript添加事件的方式有很多，本文主要列举三种添加事件的方式，包括添加到元素事件属性上、添加到Javascript脚本中、事件监听器。
1.添加到元素事件属性上
<!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>php.cn</title>
</head>
<body>
<button onclick="alert('我被调用了')">按钮1</button>
</body>
</html>2.添加到JS脚本中
<!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>php.cn</title>
</head>
<body>
<button onclick="">按钮2</button>
<script>
const btn2=document.querySelector("button");
btn2.onclick=function(){
alert("你好");
}
</script>
</body>
</html>3.事件监听器
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<!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>php.cn</title>
</head>
<body>
<button onclick="">按钮3</button>
<script>
const btn3=document.querySelector("button");
btn3.addEventListener("click",function(){
alert("被调用了");
});
</script>
</body>
</html>推荐：《2021年js面试题及答案（大汇总）》
