Question

我正在尝试制作一个电话游戏，用户在其中猜测1到100之间的数字。如果按下按钮，则该语句应运行并进行一些更改。虽然什么都没有发生。为什么在按下按钮时不执行该语句？

const buttonPressed = () => {

  if ({num} < {randomNum}) {
    message = tooLow

  } else if ({num} > {randomNum}) {
    message = tooHigh

  } else if ({num} === {randomNum}) {
    message= correct
    Alert.alert('You guessed the number in'+{counter}+'guesses')

  }
  counter += 1
}

return (
    <View style={styles.container}>
      <View>{message}</View>
        <TextInput 
           style={styles.textinput} 
           keyboardType='numeric' 
           onChangeText={(num) => setNum(num)} 
           value={num}
        />
       <Button onPress={buttonPressed} title="Press me"/>
    </View>
  );
}

Answer 1

让我们做点更多的React方式。您需要将此constructor(props) { this.state = { num: 0 } } const setNum = (num) => { this.setState({num}); } const buttonPressed = () => { if ({this.props.num} < {randomNum}) { message = tooLow counter + 1 } else if ({this.props.num} > {randomNum}) { message = tooHigh counter + 1 } else if ({this.props.num} === {randomNum}) { counter + 1 message= correct Alert.alert('You guessed the number in'+{counter}+'guesses') } } return ( <View style={styles.container}> <View>{message}</View> <TextInput style={styles.textinput} keyboardType='numeric' onChangeText={(num) => this.setNum(num)} value={this.props.num} /> <Button onPress={buttonPressed} title="Press me"/> </View> ); }设为内部状态（如果您未使用Redux或Mobx或任何其他状态管理）

类似这样的东西：

using AecDb = Autodesk.Aec.DatabaseServices;
using AecPropDb = Autodesk.Aec.PropertyData.DatabaseServices;

如果在响应本机中按下按钮时语句不起作用

1 个答案: