javascript把汉字转为拼音

Question

下面这个对象，我想用js把它转为拼音：

{

"110000":"北京市",

"110101":"东城区",

"110102":"西城区",

"110105":"朝阳区",

"110106":"丰台区",

"110107":"石景山区",

"110108":"海淀区",

"110109":"门头沟区",

"110111":"房山区",

"110112":"通州区",

"110113":"顺义区",

"110114":"昌平区",

"110115":"大兴区",

"110116":"怀柔区",

"110117":"平谷区",

"110118":"密云区",

"110119":"延庆区"

}

保存为：

{

"110000":"beijingshi",

"110101":"dongchengqu",

"110102":"xichengqu"

//...

}

怎么转呢，没点思路，请各位大佬帮说一下啊