从数组中删除特定项目,不按预期工作

Question

有人可以告诉我从数组中删除项目有什么问题？在带有axios.delete方法的deleteSingleItemHandler中,它的工作方式与它应该完全相同,并且在firebase上删除了所选项目,但是当我想从状态数组中删除项目时,它会删除项目而不是精确选择的项目,例如,我点击第三项,在firebase上删除了第三项,它在我的设备屏幕上删除了第二项......我做错了什么？

提前致谢!干杯

class HistoryScreen extends Component {
  state = {
    orders: []
  };

  componentDidMount() {
    axios
      .get(".../orders.json")
      .then(response => {
        const fetchedOrders = [];

        for (let key in response.data) {
          fetchedOrders.push({
            ...response.data[key],
            id: key
          });
        }

        this.setState({ orders: fetchedOrders });

      });
  }

  deleteSingleItemHandler = id => {
    axios
      .delete(`...orders/${id}.json`)
      .then(response => {
        console.log(response);
      });

    const newArray = [...this.state.orders];
    newArray.splice(id, 1);

    this.setState({ orders: newArray });
  };

  render() {
    return (
      <View style={styles.container}>
        <ScrollView>
          <View style={styles.completeOrder}>

              {this.state.orders.map(order => {
              return (
                <TouchableOpacity
                  key={order.id}
                  onPress={() => this.deleteSingleItemHandler(order.id)}
                >
                  <View style={styles.singleItem}>
                    <View style={styles.orderItem}>
                      <View style={{ flex: 1, marginLeft: 5 }}>
                        <Text style={{ fontFamily: Fonts.GloriaHallelujah }}>
                          {order.articleName}
                        </Text>
                      </View>

                      <View
                        style={{
                          flex: 1,
                          justifyContent: "flex-end",
                          flexDirection: "row",
                          marginRight: 5
                        }}
                      >
                        <Text>{order.articlePrice}</Text>
                      </View>
                    </View>
                  </View>
                </TouchableOpacity>
              );
            })}
          </View>
        </ScrollView>
      </View>
    );
  }
}

Answer 1

函数的第一个参数Array.prototype.splice是索引.

使用该功能 Array.prototype.findIndex

newArray.splice(newArray.findIndex(o => o.id === id), 1);

或者您可以使用该功能过滤该对象 Array.prototype.filter

newArray = newArray.filter(o => o.id !== id);