js取时间（server+client）

[b]一：用js获取server时间[/b]

var xmlHttp = false; 
  //获取服务器时间 
  try { 
    xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); 
  } catch (e) { 
    try { 
      xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 
    } catch (e2) { 
      xmlHttp = false; 
    } 
  } 

  if (!xmlHttp && typeof XMLHttpRequest != 'undefined') { 
    xmlHttp = new XMLHttpRequest(); 
  } 

  xmlHttp.open("GET", "null.txt", false); 
  xmlHttp.setRequestHeader("Range", "bytes=-1"); 
  xmlHttp.send(null); 

  severtime=new Date(xmlHttp.getResponseHeader("Date")); 

[b]二：用js+jquery取client时间，并在页面同步显示[/b]

$(document).ready(function(){
  change_online_time();
});
function change_online_time(){

  var client_date = new Date();
  var h = ( client_date.getHours() > 9 )? client_date.getHours() : "0"+client_date.getHours();
  var m = ( client_date.getMinutes() > 9 ) ? client_date.getMinutes() : "0"+client_date.getMinutes();
  var s = ( client_date.getSeconds() > 9 ) ? client_date.getSeconds() : "0"+client_date.getSeconds();

  $('#client-time').html(h+":"+m+":"+s );
  setTimeout('change_online_time()',1000);
}

html code:

<div>客户端时间：<span id="client-time">0</span></div>