JS对省市按首字母排序

/** * 省市拼音排序 */function pySegSort(arr, empty) {    if(!String.prototype.localeCompare)        return null;    var letters = "*ABCDEFGHJKLMNOPQRSTWXYZ".split('');    var zh = "阿八嚓哒妸发旮哈讥咔垃痳拏噢妑七呥扨它穵夕丫帀".split('');    var segs = [];// 存放数据    var py = [];// 存放首字母    var res = {};    var curr;    $.each(letters, function(i) {        curr = {            letter: this,            data: []        };        $.each(arr, function(k, v) {            if((!zh[i - 1] || zh[i - 1].localeCompare(v.cityName) <= 0) && v.cityName.localeCompare(zh[i]) == -1) {                curr.data.push(this);            }        });        if(empty || curr.data.length) {            py.push(this);            segs.push(curr);            curr.data.sort(function(a, b) {                return a.cityName.localeCompare(b.cityName);            });        }    });    res["segs"] = segs;    res["py"] = py;    return res;}
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/** * 调用排序 */function pinyin() {    var arr2 = [                    {"id" : "v1", "cityName" : "北京"},                    {"id" : "v2", "cityName" : "上海"},                    {"id" : "v5", "cityName" : "天津"},                    {"id" : "v7", "cityName" : "安徽"},                    {"id" : "v3", "cityName" : "呼和浩特"},                    {"id" : "v4", "cityName" : "包头"},                    {"id" : "v9", "cityName" : "海南"},                    {"id" : "v8", "cityName" : "张家口"}                ];    var str = pySegSort(arr2);    JSON.stringify(str);}
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排序后内容如下： 
{“segs”:[{“letter”:”A”,”data”:[{“id”:”v7”,”cityName”:”安徽”}]},{“letter”:”B”,”data”:[{“id”:”v4”,”cityName”:”包头”},{“id”:”v1”,”cityName”:”北京”}]},{“letter”:”H”,”data”:[{“id”:”v9”,”cityName”:”海南”},{“id”:”v3”,”cityName”:”呼和浩特”}]},{“letter”:”S”,”data”:[{“id”:”v2”,”cityName”:”上海”}]},{“letter”:”T”,”data”:[{“id”:”v5”,”cityName”:”天津”}]}],”py”:[“A”,”B”,”H”,”S”,”T”]}