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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <ul>
    <li>1</li>
    <li>2</li>
    <li>3</li>
  </ul>
</body>
</html>
 
// 不使用事件委托
// document.querySelectorAll('li').forEach(item =>{
//   item.onclick = function(){
//     console.log(this)
//   }
// })
// 使用事件委托
document.querySelector('ul').onclick = (e)=>{
  let target = e.target
   if (target.nodeName === 'LI') {
    console.log(target)
  }
}
Output

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