新增用电查询echarts和导出功能

pages/billDetail/index.js

@@ -1,20 +1,9 @@
 import { getReportDetail } from "../../service/report";
-import { alertInfo } from "../../utils/index";
+import { alertInfo, getPixelRatio } from "../../utils/index";
 import request from '../../utils/request'
 import * as echarts from '../../components/echarts/echarts';
 const { OK } = request
-const getPixelRatio = () => {
-  let pixelRatio = 0
-  wx.getSystemInfo({
-    success: function (res) {
-      pixelRatio = res.pixelRatio
-    },
-    fail: function () {
-      pixelRatio = 0
-    }
-  })
-  return pixelRatio
-}
+
 // pages/billDetail/index.js
 Page({