The method of pure JavaScript to realize ping function _javascript tips

The examples in this article describe the way pure JavaScript implements Ping. Share to everyone for your reference. The implementation method is as follows:

function Ping (IP) {var img = new Image ();
  var start = new Date (). GetTime ();
  var flag = false;
  var Isclosewifi = true;
  var hasfinish = false;
      Img.onload = function () {if (!hasfinish) {flag = true;
      Hasfinish = true;
      IMG.SRC = ' x:\\ '; Console.log (' Ping ' + IP + ' success.
    ');
  }
  };
        Img.onerror = function () {if (!hasfinish) {if (!isclosewifi) {flag = true;
        IMG.SRC = ' x:\\ '; Console.log (' Ping ' + IP + ' success.
      ');
      else {console.log (' network is not working! ');
    } Hasfinish = true;
  }
  };
    settimeout (function () {Isclosewifi = false;
  Console.log (' Network is working, start ping ... ');
  },2);
  img.src = ' http://' + IP + '/' + start;
      var timer = settimeout (function () {if (!flag) {hasfinish = true;
      IMG.SRC = ' x://';
      Flag = false; Console.log (' Ping ' + IP + ' fail.
    ');
}, 1500); Ping (' www.google.com:80 ');

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