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<!DOCTYPE html> <html> <body> <h1>HTMLCollection length 属性</h1> <p>length 属性返回 HTMLCollection 中元素的数量。</p> <p>点击按钮提示本文档中P元素的个数：</p> <button onclick="myFunction()">统计P元素</button> <script> function myFunction() { var l = document.getElementsByTagName("P").length; alert(l); } </script> </body> </html>