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JavaScript DOM NodeList 节点列表
tryjs_dom_nodelist_length
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<!DOCTYPE html> <html> <body> <h2>JavaScript HTML DOM!</h2> <p>Hellow World!</p> <p>Hellow Norway!</p> <p id="demo"></p> <script> var myNodelist = document.querySelectorAll("p"); document.getElementById("demo").innerHTML = "This document contains " + myNodelist.length + " paragraphs."; </script> </body> </html>