MediaWiki:Common.js

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$(function () {
    var webData;
    fetch("https://www.joban.tk/sysmap/data").then(function (response) {
            return response.json();
        }).then(function (data) {
            webData = data;
        });

    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) {
        var stnCount = 0;
        for (var i=0; i < webData.length; i++) {
            stnCount += Object.size(webData[i].stations);
        }
        stnElement.innerHTML = stnCount;
    }
}());