         historyMap = map;
                    $.getJSON('https://passer-by.com/data_location/diff.json',function(map){
                        diffMap = map;
                        for(var code in diffMap){
                            diffMap[code].forEach(function(value){
                                if(typeof diffMap2[value]=='undefined'){
                                    diffMap2[value] = [];
                                }
                                diffMap2[value].push(code);
           