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[summary of two registration methods]

2022-07-05 03:33:00 【renrenrenrenqq】

Summary of two registration methods

on Registration method at the beginning

Register multiple ways for the same event , The bottom will cover the top , Only one , Have uniqueness
Commonly used onclick Click on an object ,onmousemove Mouse moved ,onkeydown A key on a keyboard is pressed

<!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="annniu">button</button>
</body>
<script>
    var button=document.querySelector('#annniu')
 
    button.onclick=function(){
    
        console.dir('1')
    }
   button.onclick=function(){
    
        console.dir('2')
    }
</script>
</html>

Express only 2

2. Monitoring mode

Register multiple ways for the same event , They don't cover each other
utilize addEventListener(type（ Event type , No addition on）,listener（ Event handler ）,useCapture（ Boolean value , It can be omitted , It is often used to judge bubble and capture ）);
true capture ,false Bubbling

<!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="annniu">button</button>
</body>
<script>
    var button=document.querySelector('#annniu')
    button.addEventListener('click',function()
    {
    
        console.dir('1')
    })
    button.addEventListener('click',function()
    {
    
        console.dir('2')
    })
</script>
</html>