Javascript Element - 如何创建新的pre标签并赋值

我们想知道如何创建新的pre标签并赋值。

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<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
    document.querySelector("div").style.background = "black";
    var pre = document.createElement("pre");
    pre.textContent = document.body.innerHTML.trim();
    document.body.appendChild(pre);
}
</script>
</head>
<body>
  <div>first div</div>
  <div>second div</div>
</body>
</html>
 
 
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Javascript Element - 如何创建新的pre标签并赋值
