Javascript能不能判斷當前計算機與指定計算機（ip）的聯網狀態？

{

var ping, requestTime, responseTime ;

var getUrl = function(url){ //保證url帶plete : 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; // 阻止多重循環

// setInterval(function(){$.ping(option)}, interval);

}

};

<div id="msg"></div>

<script language="javascript" src="jquery.js"></script>

<script language="javascript" src="ping.js"></script>

<script>

$.ping({

url : '',

beforePing : function(){$('#msg').html('')},

afterPing : function(ping){$('#msg').html(ping)},

interval : 1

});

</script>