MediaWiki:Common.js

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$(function () {
    Object.size = function(obj) {
      var size = 0,
      key;
      for (key in obj) {
          if (obj.hasOwnProperty(key)) size++;
      }
    return size;
    };

    var stnElement = document.getElementById('stn-stats');
    if(!stnElement) {
        return;
    }

    fetch("https://www.joban.tk/sysmap/data").then(function (response) {
            return response.json();
        }).then(function (data) {
            if(stnElement) {
                var stnCount = 0;
                for (var i=0; i < data.length; i++) {
                    stnCount += Object.size(data[i].stations);
                 }
                 stnElement.innerHTML = stnCount;
            }
        });

	

}());