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Javascript DOM - 如何chain getElementById和getElementsByClassName...

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【get】

我们想知道如何chain getElementById和getElementsByClassName。...


<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
    var element = document.getElementById('test');
    var result =  document.getElementById('result');
    result.innerHTML = element.tagName.toUpperCase();
}
</script>
</head>
<body>
  <input id="test" type="text"value"hello">
  <div id="result"></div>
</body>
</html>