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Javascript 使用条件语句表示数组的类型_Javascript_Arrays_Reactjs_React Native_For Loop - Fatal编程技术网

Javascript 使用条件语句表示数组的类型

Javascript 使用条件语句表示数组的类型,javascript,arrays,reactjs,react-native,for-loop,Javascript,Arrays,Reactjs,React Native,For Loop,我正在构建一个react本地应用程序,它使用检查货币对的买卖价格是否达到用户设置的阈值,然后发送用户设置的消息。有两个价格阈值是有条件提供的:BuyThreshold price,即如果用户希望得到通知的价格等于当前市场购买价格,例如货币对的1.12343,例如EURUSD。另一个阈值是销售阈值,即如果用户希望得到通知的价格等于当前市场销售价格,例如货币对的1.12330,例如欧元/美元 该功能不检查市场买入价或卖出价是否达到阈值。我怎么做?代码如下: const [clickedi

我正在构建一个react本地应用程序,它使用检查货币对的买卖价格是否达到用户设置的阈值,然后发送用户设置的消息。有两个价格阈值是有条件提供的:BuyThreshold price,即如果用户希望得到通知的价格等于当前市场购买价格,例如货币对的1.12343,例如EURUSD。另一个阈值是销售阈值,即如果用户希望得到通知的价格等于当前市场销售价格,例如货币对的1.12330,例如欧元/美元 该功能不检查市场买入价或卖出价是否达到阈值。我怎么做?代码如下:

      const [clickedindex, setClickedIndex]  = useState(0)
function checkCondition({BuyThreshold, SellThreshold, SMSMessage}) {
  const BuyingPrice = {...currency.data.prices[clickedindex].BuyingPrice}
  const SellingPrice = {...currency.data.prices[clickedindex].SellingPrice}
  const currencypair = {...currency.data.prices.instrument}
  
  const BuyThresholdarray = []
  const SellThreshhold =[]

  BuyThresholdarray.push(BuyThreshold)

  const interval = setInterval(() => {
  for (let i = 0; i < BuyThresholdarray.length; i++) {
  console.log(BuyThresholdarray[i])
    if(SelectedCurrencyPair) {
      if (BuyingPrice >= BuyThresholdarray[i]) {
        return(
        console.log(SMSMessage)
        )
      }
      else {
        console.log("ALert ")
      }
    }  
  }
}, 1000);

    

        <View>
                    {
                    // Mapping of the actual currency pairs and their ask and bid prices respectively
                    currency.data.prices && currency.data.prices.map((prices, index) => {
                        return (
              <ListItem
                key={index}
                onPress = {() => {setModalOpen(true);setClickedIndex(index);}} 
                bottomDivider>
                <ListItem.Content>
                    <ListItem.Title>
                    {data.prices[index].instrument}        {data.prices[index].BuyingPrice}         {data.prices[index].SellingPrice}
                    </ListItem.Title>
                </ListItem.Content>
              </ListItem>     
                        )
                    })
        }
                </View>
    // Modal with textinputs for the Buy and Sell Thresholds
    <Modal
              visible={modalopen}
              transparent={true}
              animationType={"fade"}
              >
                
                    <Text style={{textAlign: "center", fontWeight: "bold"}}>
                      Create Alert On: 
                    </Text>          
                    <Text style={{textAlign: "center", fontWeight: "bold"}}>
                   {data.prices[clickedindex].instrument}
                  </Text>
                  <Text style={{textAlign: "center"}}>
                  {data.prices[clickedindex].BuyingPrice}/{data.prices[clickedindex].SellingPrice}
                  </Text>
                  
                  <Card.Divider/>
    
                  <View>
                    <View>
                    <Picker
                      mode= "dropdown"
                selectedValue={selectedValue}
                onValueChange={(itemValue, itemIndex) =>setSelectedValue(itemValue) }
              >
                <Picker.Item label="BuyPrice" value="BuyPrice" /> 
                <Picker.Item label="SellPrice" value="SellPrice" />
                
              </Picker>
    
                    </View>
                  
              {
                selectedValue === "BuyPrice" ? 
                <TextInput
                      style={styles.textInputStyle}
                      value={BuyThreshold}
                      onChangeText = {(BuyThreshold) => setBuyThreshhold(BuyThreshold)}
                      placeholder="BuyThreshhold"
                      placeholderTextColor="#60605e"
                      numeric
                      clearButtonMode='always'
                      keyboardType='decimal-pad'    
                    /> : 
                    <TextInput
                      style={styles.textInputStyle}
                      value={SellThreshold}
                      onChangeText = {(SellThreshhold) => setSellThreshhold(SellThreshhold)}
                      placeholder="Sell Threshhold"
                      placeholderTextColor="#60605e"
                      numeric
                      clearButtonMode='always'
                      keyboardType='decimal-pad'    
                    />
                 
    
              }
                  </View>
                 
                  <View style={{ flexDirection: "row", justifyContent:"center" }}>
                  
                    <View style={styles.inputWrap}>
                      <TextInput
                      style={styles.messageStyle}
                      value={SMSMessage}
                      onChangeText = {(SMSMessage) => setSMSMessage(SMSMessage)}
                      placeholder="Message"
                      clearButtonMode='always'
    
                      placeholderTextColor="#60605e"
                    />
    
                    </View>
                  </View>  
                  <View style={{flexDirection: "row", justifyContent: "center"}}>
                    <View>
                    <TouchableOpacity style={styles.button}
                   onPress={() => {
                     if(SMSMessage.length === 0)
                     {
                       Alert.alert("Incomplete", "Enter your Alert Message")
                       return ;
                     }
                      createAlert();
                      checkCondition({BuyThreshold, SellThreshold, SMSMessage});
                      setModalOpen(false);
                      showToastWithGravityAndOffset();} }
                      >
                       <Text style={styles.buttonTitle}>OK</Text>
                  </TouchableOpacity>
                    </View>
                    <View>
                      <TouchableOpacity style={styles.button} onPress ={() => setModalOpen(false)}>
                        <Text>Close</Text>
                      </TouchableOpacity>
    
                    </View>
                    </View>  
                  </View>
                </View>
              </Modal>
                  
const[clickedindex,setClickedIndex]=useState(0)
函数检查条件({BuyThreshold,SellThreshold,SMSMessage}){
const BuyingPrice={…currency.data.prices[单击索引].BuyingPrice}
const SellingPrice={…currency.data.prices[单击索引].SellingPrice}
const currencypair={…currency.data.prices.instrument}
常量BuySthresholdArray=[]
常数SellThreshold=[]
BuySthresholdArray.push(BuySthreshold)
常量间隔=设置间隔(()=>{
for(设i=0;i=BuyingThresholdArray[i]){
返回(
console.log(SMSMessage)
)
}
否则{
控制台日志(“警报”)
}
}  
}
}, 1000);
{
//实际货币对的映射及其分别的买卖价格
currency.data.prices&¤cy.data.prices.map((价格,指数)=>{
返回(
{setModalOpen(true);setClickedIndex(index);}
底部分隔器>
{data.prices[index].instrument}{data.prices[index].BuyingPrice}{data.prices[index].SellingPrice}
)
})
}
//具有用于购买和出售阈值的文本输入的模式
在以下情况下创建警报:
{data.prices[clickedindex].instrument}
{data.prices[clickedindex].BuyingPrice}/{data.prices[clickedindex].SellingPrice}
setSelectedValue(itemValue)}
>
{
selectedValue==“购买价格”?
SetBuyThreshold(购买阈值)}
占位符=“BuySthreshold”
占位符textcolor=“#60605e”
数字的
clearButtonMode='always'
键盘类型=“十进制键盘”
/> : 
设置SellThreshold(SellThreshold)}
占位符=“出售阈值”
占位符textcolor=“#60605e”
数字的
clearButtonMode='always'
键盘类型=“十进制键盘”
/>
}
设置短信(短信)}
占位符=“消息”
clearButtonMode='always'
占位符textcolor=“#60605e”
/>
{
如果(SMSMessage.length==0)
{
警报。警报(“不完整”,“输入您的警报消息”)
返回;
}
createAlert();
checkCondition({buystreshold,SellThreshold,smsmsmessage});
setModalOpen(假);
showtoast with gravityandoffset();}
>
好啊
setModalOpen(假)}>
接近

在哪里定义了
SelectedCurrencyPair
?这应该是
currencypair
?这是无效的javaScript:
const SellingPrice={data.prices.SellingPrice}
,还有你的问题是什么?我已经编辑了这个问题,你希望
SellingPrice
BuyingPrice
成为数组吗?我想您应该将这些设置为:
const{SellingPrice,BuyingPrice}=data.prices
您还需要检查
是否(SelectedCurrencyPair.length>0){
,因为空数组在JavaScript中是一个真实值。这是一个开始。需要更多信息才能完全解决(您能否创建一个具有类似虚拟数据的功能代码笔)?让我为上下文添加模式代码