trycss_position_top 在线代码实例

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>W3Cschool教程(w3cschool.cn)</title>
  <style>
    img {
      position: absolute;
      top: 100px;
    }
    div {
      position: absolute;
      left: 200px;
    }
  </style>
</head>
<body>
  <img src="/attachments/cover/cover_css.png" width="95" height="84" id="img">
  <div>
    <input type="text" value="0" id="num">
    <button id="change">更改top值</button>
    <h1>This is a heading</h1>
  </div>
</body>
<script>
  var img = document.getElementById('img');
  var num = document.getElementById('num');
  var btn = document.getElementById('change');
  btn.onclick = function () {
    img.style.top = num.value + 'px';
  }
</script>
</html>
 
 
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运行结果
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