小程序json字符串转为对象

    wx.getLocation({
            success: function (res) {
                var lng = res.longitude;
                var lat = res.latitude;
                var requestUrl = "https://apis.map.qq.com/ws/geocoder/v1/?location=" + lat + "," + lng + "&key=D6CBZ-D7PHQ-G7L54-GZJKF-B3PDK-MZBR4"
                wx.request({
                    url: requestUrl,
                    success: function (res) {
                        var province = res.data.result.address_component.province;
                        var city = res.data.result.address_component.city;
                        var district = res.data.result.address_component.district;
                        var address = res.data.result.address;

var location = "{\"province\": \"" + province + "\",\"city\":\"" + city + "\",\"district\":\"" + district + "\",\"address\":\"" + address + "\",\"lng\":\"" + lng + "\",\"lat\":\"" + lat + "\"}";
　　　　　　　　　　　　　　　　　　　　　
                        wx.setStorage({
                            key: ‘location_key‘,
                            data: location
                        })
                    }
                })
            },
        })
    },