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HTML DOMTokenList length 属性
tryjsref_domtokenlist_length
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<!DOCTYPE html> <html> <body> <h1>The DOMTokenList Object</h1> <h2>The length Property</h2> <p>The number of class tokens in "demo" are:</p> <p id="demo" class="c1 c2 c3"></p> <script> const list = document.getElementById("demo").classList; let number = list.length; document.getElementById("demo").innerHTML = number; </script> </body> </html>