js Node类型 nodeType 的一些写法。

发表于 作者 jiukeshuju 
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>

</head>
<body>
<ul id="u1">
  <li id="a">javascript</li>
  <li id="b">jquery</li>
  <li id="c">html</li>
</ul>
<ul id="u2">
  <li id="d">css3</li>
  <li id="e">php</li>
  <li id="f">java</li>
</ul>
  <script type="text/javascript">
    function get_nextSibling(n) {
      var x=n.nextSibling;
      while (x && x.nodeType!=1) {
        x=x.nextSibling;
      }
      return x;
    }

    var x=document.getElementsByTagName('li')[0];
    document.write(x.nodeName);
    document.write(' = ');
    document.write(x.innerHTML);

    var y=get_nextSibling(x);

    if (y!=null) {
      document.write('<br />nextSibling:');
      document.write(y.nodeName);
      document.write(' = ');
      document.write(y.innerHTML);
    }
    else {
      document.write('<br />已经是最后一个节点');
    }
  //get_previousSibling
  function get_previousSibling(n) {
    var m=n.previousSibling;
    while (m && m.nodeType!=1) {
      m=m.previousSibling;
    }
    return m
  }

    var m=document.getElementById('b');
    document.write('<br />'+m.nodeName);
    document.write(' = ');
    document.write(m.innerHTML);

    var h=get_previousSibling(m);

    if (h!=null) {
      document.write('<br />previousSibling:');
      document.write(h.nodeName);
      document.write(' = ');
      document.write(h.innerHTML);
    }
    else {
      document.write('<br />已经是最前的一个节点');
    }
  </script>
</body>
</html>

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