<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <div> <p id="demo">点击下方按钮显示时间</p> <button type="button" onclick="displayData()">北京时间</button> </div> <script> function displayData() { // 注意Date单词拼写 document.getElementById("demo").innerHTML = Date(); } </script> </body> </html>