Javascript DOM - 如何get by tag name vs get by id

我们想知道如何get by tag name vs get by id。


<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
    var element = document.getElementById("testDiv");
    console.log("By Id: " + element.innerHTML);

    var element2 = document.getElementsByTagName("div");
    console.log("By Tag Name: " + element2[0].innerHTML);

}
</script>
</head>
<body>
  <div id="testDiv" name="testHolder">Test Content</div>
</body>
</html>

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Javascript DOM - 如何get by tag name vs get by id