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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>
  <div class="parent">
    <div class="child">
      子元素设置absolute,margin:auto,top、bottom、left、right为0
    </div>
  </div>
</body>
</html>
 
.parent {
  border: 1px solid red;
  height: 200px;
  position: relative;
}
.child {
  border: 1px solid green;
  position: absolute;
  width: 200px;
  height: 100px;
  margin: auto;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}
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anonymouspro
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