json转换问题，求解求搭救。。。。。。。。。

[ 
 { 
wFrom: { 
 fLatitude: "114.057868", 
 fLongitude: "22.543099", 
 fName: "深圳市" 
 }, 
wTo: { 
 tLatitude: "37.6173", 
 tLongitude: "55.755826", 
 tName: "Moscow" 
 }, 
 wValue: "31", 
 wkey: "深圳市", 
wproperties: "bag" 
 }, 
 { 
 wFrom: { 
 fLatitude: "116.681972", 
 fLongitude: "23.354091", 
 fName: "汕头市" 
 }, 
wTo: { 
 tLatitude: "37.6173", 
 tLongitude: "55.755826", 
 tName: "Moscow" 
 }, 
 wValue: "24", 
 wkey: "汕头市", 
wproperties: "Baby Toys" 
 } 
 ];

上面个数组怎么遍历构造出下面这种结构的数据：
var geodata = { "Moscow":[37.6173,55.755826],
"深圳市":[114.057868,22.543099],
"汕头市":[116.681972,23.354091] };
求高手指点啊