<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here222222222222</title>
<script type="text/javascript" src="js/jquery-1.8.0.js"></script>
<script type="text/javascript">
$.ping = function(option) {
var ping, requestTime, responseTime;
var getUrl = function(url) {
// 保证url带http://
var strReg = "^((https|http)?://){1}"
var re = new RegExp(strReg);
return re.test(url) ? url : "http://" + url;
}
$.ajax({
url : getUrl(option.url) + ‘/‘ + (new Date()).getTime() + ‘.html‘,
// 设置一个空的ajax请求
type : ‘GET‘,
dataType : ‘html‘,
timeout : 10000,
beforeSend : function() {
if (option.beforePing)
option.beforePing();
requestTime = new Date().getTime();
},
complete : function() {
responseTime = new Date().getTime();
ping = Math.abs(requestTime - responseTime);
if (option.afterPing)
option.afterPing(ping);
}
});
if (option.interval && option.interval > 0) {
var interval = option.interval * 1000;
setTimeout(function() {
$.ping(option)
}, interval);
// option.interval = 0; // 阻止多重循环
// setInterval(function(){$.ping(option)}, interval);
}
};
</script>
<script type="text/javascript">
function t() {
$.ping({
url : ‘http://www.9188.com/‘,
beforePing : function() {
$(‘#msg0‘).html(‘‘)
},
afterPing : function(ping) {
$(‘#msg1‘).html(ping)
},
interval : 5
});
}
</script>
</head>
<body>
<a href="javascript:;" onclick="t();">reqServer</a>
<br>
<div id="msg0"></div>
<div id="msg1"></div>
</body>
</html>
原文：http://ether007.blog.51cto.com/8912105/1563572