<!DOCTYPE html> <html> <body> <h1>Window History 对象</h1> <h2>history.length 属性</h2> <p>历史列表中的 URL 数量:</p> <p id="demo"></p> <p>由于这是新的窗口框架,history.length 将始终返回 1。</p> <script> let length = history.length; document.getElementById("demo").innerHTML = length; </script> </body> </html>