둘에서 하나로....

[react native] 로또 번호 생성기 본문

프로그래밍

[react native] 로또 번호 생성기

세상에 둘도 없는 서기㏇ 2021. 2. 18. 20:01
import { StatusBar } from 'expo-status-bar';
import React, { useEffect, useState } from 'react';
import { Button, StyleSheet, Text, View } from 'react-native';

export default function App() {

  const [lotto, setLotto] = useState([]); 

 

  function makeLotto(){
    let i = 0; 
    let lnumber = [];
    let rnumber = 0; 

    let lottos = []; 
    let a = 0; 

    for(i=1; i<=45; i++){
        lottos.push(i); 
    }
    
    for(i=0; i<=44; i++){
      rnumber = Math.floor(Math.random()*45);   
      
      a = lottos[i]; 
      lottos[i] = lottos[rnumber];
      lottos[rnumber] = a;
 
    }
    console.log(lottos); 




    for(i=0; i<6; i++){                
        lnumber.push(lottos[i]);
    }

 
    setLotto(lnumber); 
    
  }


  useEffect( ()=>{
    makeLotto(); 
  },[]); 


  return (
    <View style={styles.container}>
      <Text style={{marginBottom:100, }}>로또앱</Text>

      <Button title="로또번호 생성" onPress={()=>makeLotto()} /> 

      <Text style={{fontSize:25, }}> {lotto.toLocaleString()} </Text>
      <StatusBar style="auto" />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});
0 Comments
댓글쓰기 폼