json对象相同key合并value值

 var s = '{"身高":"175cm","性别":"男","兴趣":"唱歌","兴趣":"棒球","兴趣":"游泳"}'    var kv = {}, m, reg = /"[^"]+":"[^"]+"/gi;    var m = s.match(reg);    var o={};    for(var i=0;i<m.length;i++){        kv=m[i].match(/"[^"]+"/gi);         var _arr1=[];;        for(var j=0;j<kv.length; j++){            _arr1.push(kv[j].replace(/"/g,''));        }        if(_arr1[0] in o){            if(typeof(o[_arr1[0]])=='string')            {                o[_arr1[0]]=[o[_arr1[0]]]            };            o[_arr1[0]].push(_arr1[1])        }else{            o[_arr1[0]]=_arr1[1]        }    }    console.log(o)//'{"身高":"175cm","性别":"男","兴趣":["唱歌,"棒球","游泳"]}'