因此，我试图将const变量从一个文件转移到另一个文件。由于某种原因，我无法访问它，它也不允许我在文本文件中显示它下面是homepage.js代码和pay.js文件。我试图将displayedAmount变量从主页文件转移到支付文件，然后将其显示在文本元素中。但是当我这样做时，我得到这个错误“错误：文本字符串必须在组件内呈现。”

import { StyleSheet, Text, View, Image, Dimensions, TouchableOpacity, Alert, Animated } from 'react-native';
import { FontAwesome5 } from '@expo/vector-icons';
import React, { useState, useEffect, useRef } from 'react';
import { useNavigation } from '@react-navigation/native';
import pay from './pay';
const homepage = ({ route, navigation }) => {
  const [selectedAmount, setSelectedAmount] = useState("0");
  const [displayedAmount, setDisplayedAmount] = useState("0");
  const fadeAnim = new Animated.Value(0);  // initial opacity
  const screenWidth = Dimensions.get('window').width;
  const buttonWidth = screenWidth * 0.45;
  const spaceBetweenNumbers = 100;
  
  
  useEffect(() => {
    Animated.timing(
      fadeAnim,
      {
        toValue: 1,
        duration: 1000,
        useNativeDriver: true,
      }
    ).start();
    
    if (selectedAmount.includes('.')) {
        const [whole, decimal] = selectedAmount.split('.');
        setDisplayedAmount(`${isNaN(parseInt(whole)) ? "0" : parseInt(whole).toLocaleString()}.${decimal}`);
      } else {
        setDisplayedAmount(isNaN(parseInt(selectedAmount)) ? "0" : parseInt(selectedAmount).toLocaleString());
      }
    Animated.timing(
      fadeAnim,
      {
        toValue: 0,
        duration: 1000,
        useNativeDriver: true,
      }
    ).start();
  }, [selectedAmount]);
  const handleNumberPress = (number) => {
    if (selectedAmount.length < 5) {
      setSelectedAmount(prevState => prevState === "0" ? String(number) : prevState + number);
    }
  };
  const handleDecimalPress = () => {
    if (!selectedAmount.includes(".") && selectedAmount.length < 4) {
      setSelectedAmount(prevState => prevState + ".");
    }
  };
  const handleDeletePress = () => {
    setSelectedAmount(prevState => prevState.slice(0, -1) || "0");
  };
  const goTopay = () => {
    navigation.navigate('Pay', { displayedAmount }); // passing displayedAmount as a parameter
  };

个字符