优化测量时的问题

src/pages/Measure.tsx

@@ -113,6 +113,10 @@ export default function Measure() {
   const onStartClick = () => {
     setshowCalibration(false)
     dispatch(updateMeasureData([]))
+    if (contextState.device.power < 20) {
+      Toast.show("电量低于20%，请充电后测量");
+      return;
+    }
     if (!contextState.device.connected) {
       Dialog.alert({
         content: '蓝牙未连接，请先连接蓝牙',