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<!DOCTYPE html> <html> <body> <h1>存储长度属性</h1> <p>此示例演示如何使用 length 属性获取存储在本地存储对象中的项目数。</p> <button onclick="myFunction()">获取存储项的数量</button> <p id="demo"></p> <script> function myFunction() { var x = localStorage.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>