This article mainly shares with you js to obtain the real-time time of the server. It mainly shares with you the code method. I hope it can help everyone.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>AJAX获取服务器时间</title>
<script type="text/javascript">
/*
* ajax 函数，处理 ajax 请求
* @param function callback 回调函数
* @因为要和服务器交互，所以必须在服务器环境运行，不能在硬盘上直接打开
*/
function ajax(callback){
if(typeof callback!='function') return;
var ajaxObject;
try{
ajaxObject=new XMLHttpRequest();
}catch(e){
try{
ajaxObject=new ActiveXObject('Microsoft.XMLHTTP');
}catch(e){
}
}
if(!ajaxObject) return;
if(ajaxObject.overrideMimeType){
ajaxObject.overrideMimeType('text/html');
}
//location.href可以换成其他url，但必须是同一个站点的链接，并且文件存在
ajaxObject.open('get',location.href);
ajaxObject.send(null);
ajaxObject.onreadystatechange=function(){
if(ajaxObject.readyState==4){
if(ajaxObject.status==200){
callback(ajaxObject);
}
}
};
}
/*
* 获取时间并动态刷新
*/
function getTime(){
ajax(
function(ao){
//只需要AJAX一次，将服务器时间获取后以毫米为单位保存到一个变量中
_timestamp=Date.parse(ao.getResponseHeader('Date'));
_timestamp=_timestamp.toString().match(/^\d$/)?_timestamp:new Date().getTime();
//设置定时器每过一秒动态刷新一次时间
setInterval(
function(){
//这里可以自定义时间显示格式
document.getElementById('_timer').innerHTML=new Date(_timestamp).toLocaleString();
_timestamp+=1000;
},
1000
);
}
);
}
window.onload=getTime;
</script>
</head>
<body>
<p id="_timer">正在获取服务器时间……</p>
</body>
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js high-efficiency server time synchronization example
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