gger: 'item'
                    },
                    legend: {
                        orient: 'vertical',
                        top: 'bottom',
                        left: 'right',
                        data:['pm2.5'],
                        textStyle: {
                            color: '#fff'
                        }
                    },
                    geo: {
                        map: 'china',
                        label: {
                            emphasis: {
                  