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Document.documentElement 會回傳目前文件(document)中的根元素(Element),如:HTML 文件中的 <html> 元素。


var element = document.documentElement;


var rootElement = document.documentElement;
var firstTier = rootElement.childNodes;

// firstTier is the NodeList of the direct children of the root element
for (var i = 0; i < firstTier.length; i++) {
   // do something with each direct kid of the root element
   // as firstTier[i]


HTML documents typically contain a single child node, <html>, perhaps with a DOCTYPE declaration before it. XML documents often contain multiple child nodes: the root element, the DOCTYPE declaration, and processing instructions.

That's why you should use document.documentElement rather than document.firstChild to get the root element.



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