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<!DOCTYPE html> <html> <body onload="normPara()"> <h1>Document 对象</h1> <h2>normalize() 方法</h2> <button onclick="addTextNode()">添加文本节点</button> <button onclick="normPara()">规范化此文档</button> <p>此文档拥有 <span id="cc" style="font-size:20px">1</span> 个子节点。</p> <script> function addTextNode() { const textNode= document.createTextNode("再次点击。"); const body = document.body; body.appendChild(textNode); const cc = document.getElementById("cc"); cc.innerHTML = body.childNodes.length; } function normPara() { document.normalize(); const body = document.body; const cc = document.getElementById("cc"); cc.innerHTML = body.childNodes.length; } </script> </body> </html>