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js-basic
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event事件对象.html

<!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>
  <style>
    #box {
      width: 200px;
      height: 50px;
      background-color: skyblue;
    }
  </style>
</head>
<body>
  <div id="box"></div>
  <br>
  <input type="text" name="" id="input">
  <script>
    let box = document.getElementById('box')
    let input =document.getElementById('input')
    // box.addEventListener('click', function(event) {
      // console.log(event);
    // })

    input.addEventListener('keyup', function(e) {
      box.innerHTML = e.target.value
    })
  </script>
  <!--
    event事件对象
   -->
</body>
</html>