pinyinHash.js

var pinyin = require('pinyin');
var cities = require('./cityselect-open').data;
var pinyinHash = {
    data: {},
    addItem: function(name) {
        if(this.data.hasOwnProperty(name) || !name) {
            return;
        }

        var pinyinText = pinyin(name, {
            style: pinyin.STYLE_NORMAL,
            heteronym: false
        }).join('');

        var pinyinFirstLetter = pinyin(name, {
            style: pinyin.STYLE_FIRST_LETTER,
            heteronym: false
        }).join('');

        this.data[name] = {
            pinyin: pinyinText,
            acronym: pinyinFirstLetter
        };
    }
};

for(var i in cities.data) {
    if(cities.data.hasOwnProperty(i)) {
        pinyinHash.addItem(cities.data[i].name);

        if(!cities.data[i].cities) {
            continue;
        }

        for(var j in cities.data[i].cities) {
            if(cities.data[i].cities.hasOwnProperty(j)) {
                pinyinHash.addItem(cities.data[i].cities[j].name);
            }
        }
    }
}

console.log(pinyinHash.data);