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demo22.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.container,
.box,
.target{
border: 1px solid;
padding: 10px;
}
</style>
</head>
<body>
<button id="btn">click</button>
<h2>打开控制台看</h2>
<div class="container">
container
<div class="box">
box
<div class="target">target</div>
</div>
</div>
<script>
function $(selector){
return document.querySelector(selector)
}
var btn = $('#btn')
btn.onclick = function (e){
console.log(e)
}
btn.addEventListener('click', function(evt){
console.log(this)
console.log(btn)
console.log(evt.target)
})
$('.container').addEventListener('click', function(e){
console.log('contianer click.. in 捕获阶段')
}, true)
$('.box').addEventListener('click', function(e){
//e.stopPropagation()
console.log('box click.. in 捕获阶段')
}, true)
$('.target').addEventListener('click', function(e){
console.log('target click.. in 捕获阶段')
}, true)
$('.container').addEventListener('click', function(e){
console.log('contianer click.. in 冒泡阶段')
}, false)
$('.box').addEventListener('click', function(e){
e.stopPropagation()
console.log('box click.. in 冒泡阶段,我在这里阻止了冒泡,container的冒泡阶段就没了')
}, false)
$('.target').addEventListener('click', function(e){
console.log('target click.. in 冒泡阶段')
}, false)
</script>
</body>
</html>