javascript - 从 .JSON 访问值时出现问题(可能是路径问题)

Question

我有一个使用 api 数据的 React 组件:

class Item extends Component {
constructor(props) {
  super(props);
  this.state = {
    output: {}
  }
}

componentDidMount() {
    fetch('http://localhost:3005/products/157963')
      .then(response => response.json())
      .then(data => this.setState({ output: data }));
  }


render() {
    console.log(this.state.output);
    const { general = {name:""} } = this.state.output;
    const { id } = this.state.output;
    const { images = {large:""} } = this.state.output;
  return (
    <ItemPanel>
    <ItemBox>
    <BoxTitle>{general.name}</BoxTitle>
    <BoxId>Item ID: {id}</BoxId>
    <Details onClick={show_details}>Show more...</Details>
        <Inline>
        <Quantity type="number" defaultValue="1"></Quantity>
        <Icon>add_shopping_cart</Icon>
        </Inline>
        <AddItem>
        <Sfont>Add to cart</Sfont>
    </AddItem>
    </ItemBox>
        <BoxImg src={images} alt='img error'></BoxImg>
</ItemPanel>
  );
}
}
export default Item;

这就是 .JSON 的样子:

{
"id": "774944",
"general": {
  "presentable_id": "774944",
  "name": "Blekk BROTHER LC1280XLC blå",
  "description": ""
},
"brand": {
  "name": "Brother Norge AS"
},
"images": {
  "primary": {
    "large": "https://i.imgur.com/zYcibjw.jpg"
  }
}
}

我需要从“images/primary”中的“large”访问图像 src 链接。在这里尝试了很多变体，但它总是返回为空或 undefined object :/

Answer 1

const {images:{primary:{large}}} = this.state.output;
console.log(large)

您将在大变量中拥有图像路径。