柱状图垂直居中；

src/views/PlatformData/UserOverview.vue

@@ -306,14 +306,16 @@ const initCharts = () => {
                         type: 'bar',
                         barWidth: '20%',
                         color: '#40a9ff',
-                        data: [580, 1150, 650, 780, 0, 0]
+                        data: [580, 1150, 650, 780, 0, 0],
+                        stack: 'total'
                     },
                     {
                         name: '老用户',
                         type: 'bar',
                         barWidth: '20%',
                         color: '#9287e7',
-                        data: [0, 0, 0, 0, 1100, 1300]
+                        data: [0, 0, 0, 0, 1100, 1300],
+                        stack: 'total'
                     }
                 ]
               });