jquery插件：用JS实现ping的功能（JS ping url）转

 

01. $.ping = function (option) 

02. {

03.      var ping, requestTime, responseTime ;

04.      var getUrl = function (url){    //保证url带http://

05.          var strReg= "^((https|http)?://){1}"

06.          var re= new RegExp(strReg); 

07.          return re.test(url)?url: "http:// " +url;

08.      }

09.      $.ajax({

10.          url: getUrl(option.url)+ '/' + ( new Date()).getTime() + '.html' ,  //设置一个空的ajax请求

11.          type: 'GET' ,

12.          dataType: 'html' ,

13.          timeout: 10000,

14.          beforeSend : function () 

15.          {

16.              if (option.beforePing) option.beforePing();

17.              requestTime = new Date().getTime();

18.          },

19.          complete : function () 

20.          {

21.              responseTime = new Date().getTime();

22.              ping = Math.abs(requestTime - responseTime);

23.              if (option.afterPing) option.afterPing(ping);

24.          }

25.      });

26.        

27.      if (option.interval && option.interval > 0)

28.      {

29.          var interval = option.interval * 1000;

30.          setTimeout( function (){$.ping(option)}, interval);

31. //      option.interval = 0;        // 阻止多重循环

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

33.      }

34. };

应用举例：

 

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

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

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

<script>

$.ping({

url : 'http://www.example.com', 

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

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

interval : 1

});

</script>