JavaScript实现下拉选择时区并实时显示时间及相关信息

<span id="ct"></span><br> <span id="ct2"></span><br>  <select name="tz"></select>  <p>Select Timezone above</p>  <br><br>  <!-- 以下是根据不同时区显示的信息表格，id从t1到t7 --> <table id="t1" border="1">   <tr>     <th>Country</th>     <th>Capital</th>   </tr>   <tr>     <td>Philippines</td>     <td>Manila</td>   </tr> </table>  <table id="t2" border="1">   <tr>     <th> Province/Territory</th>     <th> Time Zone</th>     <th> Capital</th>     <th> Other Cities</th>   </tr>   <tr>     <td> Ontario</td>     <td> Eastern</td>     <td> Toronto</td>     <td> Ottawa, Mississauga, <br>Hamilton, Kitchener, <br>London, Oshawa, <br>windsor, Barrie, <br>Guelph, kingston, <br>Sudbury, Thunder Bay, <br>Etobicoke</td>   </tr>   <tr>     <td> Quebec</td>     <td> Eastern</td>     <td> Quebec City</td>     <td> Montreal, Sherbrooke, <br>Trois-Rivières, Chicoutimi, <br>Châteauguay, Granby</td>   </tr>   <tr>     <td> Nunavut</td>     <td> Eastern</td>     <td> Iqaluit</td>     <td> Cambridge Bay, Rankin Inlet</td>   </tr> </table>  <table id="t3" border="1">   <tr>     <th> Province/Territory</th>     <th> Time Zone</th>     <th> Capital</th>     <th> Other Cities</th>   </tr>   <tr>     <td> Nova Scotia</td>     <td> Atlantic</td>     <td> Halifax</td>     <td> Cape Breton, Sydney, <br>Truro, Dartmouth </td>   </tr>   <tr>     <td> New Brunswick</td>     <td> Atlantic</td>     <td> Fredericton</td>     <td> Moncton, Saint John, <br>Fredericton</td>   </tr>   <tr>     <td> Prince Edward Island</td>     <td> Atlantic</td>     <td> Charlottetown</td>     <td> Summerside, Stratford</td>   </tr> </table>  <table id="t4" border="1">   <tr>     <th> Province/Territory</th>     <th> Time Zone</th>     <th> Capital</th>     <th> Other Cities</th>   </tr>   <tr>     <td> Manitoba</td>     <td> Central</td>     <td> Winnipeg</td>     <td> Brandon, Churchill, <br>Steinbach, Winkler, <br>Portage La Prairie, Thompson</td>   </tr> </table>  <table id="t5" border="1">   <tr>     <th> Province/Territory</th>     <th> Time Zone</th>     <th> Capital</th>     <th> Other Cities</th>   </tr>   <tr>     <td> British Columbia</td>     <td> Pacific</td>     <td> Victoria</td>     <td> Vancouver, Surrey, <br>Burnaby, Richmond, <br>Abbotsford, Coquitlam, <br>Kelowna, Nanaimo, <br>Kamloops</td>   </tr>   <tr>     <td> Yukon</td>     <td> Pacific</td>     <td> Whitehorse</td>     <td> Cambridge Bay, Rankin Inlet</td>   </tr> </table>  <table id="t6" border="1">   <tr>     <th> Province/Territory</th>     <th> Time Zone</th>     <th> Capital</th>     <th> Other Cities</th>   </tr>   <tr>     <td> Saskatchewan</td>     <td> Mountain</td>     <td> Regina</td>     <td> Saskatoon, Moose Jaw, <br>Swift Current, Yorkton</td>   </tr>   <tr>     <td> Alberta</td>     <td> Mountain</td>     <td> Edmonton</td>     <td> Calgary, Red Deer, <br>Lethbridge, Airdrie, <br>Medicine Hat, Grande Prairie, <br>Banff</td>   </tr>   <tr>     <td> Northwest Territories</td>     <td> Mountain</td>     <td> Yellowknife</td>     <td> Inuvik</td>   </tr> </table>  <table id="t7" border="1">   <tr>     <th> Province/Territory</th>     <th> Time Zone</th>     <th> Capital</th>     <th> Other Cities</th>   </tr>   <tr>     <td> Newfoundland and Labrador</td>     <td> Newfoundland</td>     <td> St. John's</td>     <td> Corner Brook, Grand Falls-Windsor, <br>Gander</td>   </tr> </table>

#ct {   font-family: arial;   font-size: 15px; }  p {   font-family: arial;   font-size: 15px; }  select {   -webkit-appearance: none;   -moz-appearance: none;   appearance: none;   padding: 1px;   font-size: 15px; }  td, th {   text-align: left;   padding: 5px;   font-family: arial;   font-size: 15px; }  th {   text-align: center;   padding: 5px;   font-family: arial;   font-size: 15px; }

// 隐藏ct2元素，因为它可能在某些情况下不需要立即显示 var link = document.getElementById('ct2'); link.style.visibility = 'hidden';  // 获取下拉菜单元素 const sel = document.querySelector("[name=tz]");  // 定义一个函数来显示实时时区时间 const disp_TZ = () => {   const tz = sel.value; // 获取当前选中的时区值   // 使用toLocaleString获取指定时区的完整时间信息   let str = new date().toLocaleString("en-US", {     timeZone: tz,     timeZoneName: "short"   });   document.getElementById('ct').innerHTML = str + " ,<br> " + tz;    // 计算并显示简化的时分秒   const dt2 = new Date();   const str2 = new Date(dt2.toLocaleString('en-US', {     timeZone: tz   }));   const diff = dt2.getTime() - str2.getTime();   const dt3 = new Date(dt2.getTime() - diff);   const hour = dt3.getHours();   const minute = dt3.getMinutes();   const seconds = dt3.getSeconds();   const str3 = `${hour}:${minute}:${seconds}`; // 模板字符串格式化   document.getElementById('ct2').innerHTML = str3;    display_c(); // 继续调用以实现实时更新 };  // 定义可供选择的时区列表 var my_timezones = [   'None Selected ',   'Asia/Manila',   'Canada/Eastern',   'Canada/Atlantic',   'Canada/Central',   'Canada/Pacific',   'Canada/Mountain',   'Canada/Newfoundland' ];  // 获取所有以't'开头的表格元素 const tables = document.querySelectorAll("table[id^=t]");  // 定义一个函数来切换表格的显示状态 const toggleStyle = () => {   const idx = sel.selectedIndex; // 获取下拉菜单当前选中项的索引    // 遍历所有表格，根据索引决定是否显示   tables.foreach(table => table.hidden = (table.id !== `t${idx}`)); };  // 动态填充下拉菜单选项 my_timezones.forEach(tz => {   let opt = document.createElement('option');   opt.text = tz;   opt.value = tz;   sel.appendChild(opt); });  // 定义一个函数来每秒刷新时间显示 const display_c = () => {   const refresh = 1000; // 1秒刷新一次   setTimeout(disp_TZ, refresh); // 使用setTimeout递归调用disp_TZ };  // 为下拉菜单添加事件监听器 sel.addEventListener("change", disp_TZ); // 选项改变时更新时间 sel.addEventListener("change", toggleStyle); // 选项改变时切换表格显示  // 初始化页面状态：首次加载时隐藏所有表格，并显示初始时间 toggleStyle(); disp_TZ(); // 首次加载时调用一次以显示时间

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