<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
 <title></title>

 <!-- JavaScript代码 -->
 <script>
  //  console.log("URL地址: " + window.location.href);
  //  console.log("主机名: " + window.location.hostname);
  //  console.log("端口: " + window.location.port);
  //  console.log("主机: " + location.host); // 主机名+端口
  //  console.log("协议: " + location.protocol);
  //  console.log("路径: " + location.pathname);

  //  console.log("有效的宽度（单位：像素）: " + screen.availWidth);
  //  console.log("有效的高度（单位：像素）: " + screen.availHeight);
  //  console.log("每个像素颜色的位数: " + screen.colorDepth);

  //  document.write("官方浏览器代码名的字符串的表示：" + navigator.appCodeName + "<br/>");
  //  document.write("官方浏览器名的字符串的表示：" + navigator.appName + "<br/>");
  //  document.write("用户代理：" + window.navigator.userAgent + "<br/>");
  //  document.write("版本信息：" + window.navigator.appVersion + "<br/>");
  //  document.write("浏览器所在的计算机的平台：" + window.navigator.platform + "<br/>");
  //  document.write("Cookie：" + window.navigator.cookieEnabled + "<br/>");
 </script>
</head>
<body>
<script>
 function remove() {
  var r = confirm("确定要删除吗？");
  console.log(r);
 }

 prompt("您几岁？");
</script>
<table>
 <tr>
  <th>姓名</th>
  <th>年龄</th>
  <th>操作</th>
 </tr>
 <tr>
  <td>张三</td>
  <td>19</td>
  <td><input type="button" value="删除" onclick="return remove();"/></td>
 </tr>
 <tr>
  <td>李四</td>
  <td>18</td>
  <td><input type="button" value="删除" onclick="return remove();"/></td>
 </tr>
 <tr>
  <td>王五</td>
  <td>20</td>
  <td><input type="button" value="删除" onclick="return remove();"/></td>
 </tr>
 <tr style="display: none">
  <td>赵六</td>
  <td>21</td>
  <td><input type="button" value="删除" onclick="return remove();"/></td>
 </tr>
 <tr>
  <td>孙七</td>
  <td>20</td>
  <td><input type="button" value="删除" onclick="return remove();"/></td>
 </tr>
</table>
</body>
</html>