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HTML DOM NodeList length 属性
tryjsref_nodelist_length
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<!DOCTYPE html> <html> <body> <h1>The NodeList Object</h1> <h2>The length Property</h2> <!-- This is a comment node! --> <p>The number of child nodes in the body element are:</p> <p id="demo"></p> <p>Whitespace between elements are text nodes. Comments are also nodes.</p> <script> const nodeList = document.body.childNodes; let number = nodeList.length; document.getElementById("demo").innerHTML = number; </script> </body> </html>