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Javascript DOM - 如何删除DOM节点而不留空格

我们想知道如何删除DOM节点而不留空格。

<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
    var elem = document.getElementById('baz');
    elem.parentNode.removeChild(elem);
}
</script>
</head>
<body>
  ... foo
  <span id="baz">removed</span>bar ...
</body>
</html>