Javascript添加事件的三种方式

时间：2021-04-08 15:01

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>gxlsystem.com</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>gxlsystem.com</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

<!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>gxlsystem.com</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>

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