新增用电查询echarts和导出功能

utils/index.js

@@ -220,3 +220,16 @@ export const wxModal = (data) => {
   })
 }
 
+
+export const getPixelRatio = () => {
+  let pixelRatio = 0
+  wx.getSystemInfo({
+    success: function (res) {
+      pixelRatio = res.pixelRatio
+    },
+    fail: function () {
+      pixelRatio = 0
+    }
+  })
+  return pixelRatio
+}