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HTML DOM NodeList length 属性
tryjsref_nodelist_length_p_loop
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<!DOCTYPE html> <html> <body> <h1>The Nodelist Object</h1> <h2>The length Property</h2> <button onclick="myFunction()">Change</button> <p>Click "Change" to change the font size of all p elements inside "myDIV".</p> <div id="myDIV" style="border:1px solid black; padding:16px;"> <p>I am a paragraph.</p> <p>I am a paragraph.</p> <p>I am a paragraph.</p> </div> <script> function myFunction() { const div = document.getElementById("myDIV"); const list = div.querySelectorAll("p"); for (let i = 0; i < list.length; i++) { list[i].style.fontSize = "24px"; } } </script> </body> </html>