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<!DOCTYPE html> <html> <head> <style> #cc { font-size: 20px; color: red; } </style> </head> <body onload="normPara()"> <p id="demo">单击一个按钮向文档添加文本，单击另一个按钮规范化文档。</p> <button onclick="addTextNode()">添加文本节点</button> <button onclick="normPara()">规范化文件</button> <p>该文档有 <span id="cc">1</span> 个子节点。</p> <script> function addTextNode() { var x = document.createTextNode(" 再次点击。 "); var y = document.body; y.appendChild(x); var x = document.getElementById("cc"); x.innerHTML = y.childNodes.length; } function normPara() { document.normalize(); var x = document.body; var y = document.getElementById("cc"); y.innerHTML = x.childNodes.length; } </script> </body> </html>