javascript - 为什么我无法访问状态中的嵌套数据-6ren

javascript - 为什么我无法访问状态中的嵌套数据

转载作者：行者123 更新时间：2023-11-28 14:14:33

我正在尝试访问存储在 this.state.data 中的嵌套数组和对象。但我无法访问数组，有人能告诉我为什么吗？任何人都可以知道为什么错误“无法读取未定义的属性'0'”不断弹出。这个错误让我抓狂。我不明白为什么会出现这种情况。

import React from 'react';

const url="https://pixabay.com/api/?key=13565216-b3f251bf75153fd651dec947c&q=yellow+flowers&image_type=photo&pretty=true";

class App extends React.Component{
  constructor(props){
    super(props);
    this.state = {
      input : '',
      data: '',
      isloading: true
    }
    this.fetchData=this.fetchData.bind(this);
  }

  componentDidMount(){
    this.fetchData();
  }

  fetchData(){
    fetch(url)
    .then(res=>res.json())
    .then(result=>{
      this.setState({
        data:result,
        isloading: false
      })
    });
  }

  render(){
    return(
      <>
      {
        console.log(this.state.data.hits[0])
      }
      </>
    );
  }
}

export default App;

json数据在这里:

{
    "totalHits":500,
    "hits":[
        {
            "largeImageURL":"https://pixabay.com/get/55e0d340485aa814f6da8c7dda79367d1039dbe752576c48702972d09445c45dba_1280.jpg",
            "webformatHeight":426,
            "webformatWidth":640,
            "likes":1008,
            "imageWidth":6000,
            "id":3063284,
            "user_id":1564471,
            "views":651677,
            "comments":226,
            "pageURL":"https://pixabay.com/photos/rose-flower-petal-floral-noble-3063284/",
            "imageHeight":4000,
            "webformatURL":"https://pixabay.com/get/55e0d340485aa814f6da8c7dda79367d1039dbe752576c48702972d09445c45dba_640.jpg",
            "type":"photo",
            "previewHeight":99,
            "tags":"rose, flower, petal",
            "downloads":416283,
            "user":"annca",
            "favorites":873,
            "imageSize":3574625,
            "previewWidth":150,
            "userImageURL":"https://cdn.pixabay.com/user/2015/11/27/06-58-54-609_250x250.jpg",
            "previewURL":"https://cdn.pixabay.com/photo/2018/01/05/16/24/rose-3063284_150.jpg"
        },
        {
            "largeImageURL":"https://pixabay.com/get/55e1d4404953a414f6da8c7dda79367d1039dbe752576c48702972d09445c45dba_1280.jpg",
            "webformatHeight":426,
            "webformatWidth":640,
            "likes":788,
            "imageWidth":2736,
            "id":3113318,
            "user_id":7410713,
            "views":433603,
            "comments":123,
            "pageURL":"https://pixabay.com/photos/sunflower-nature-flora-flower-3113318/",
            "imageHeight":1824,
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            "type":"photo",
            "previewHeight":99,
            "tags":"sunflower, nature, flora",
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            "user":"bichnguyenvo",
            "favorites":526,
            "imageSize":1026006,
            "previewWidth":150,
            "userImageURL":"https://cdn.pixabay.com/user/2017/12/16/10-28-39-199_250x250.jpg",
            "previewURL":"https://cdn.pixabay.com/photo/2018/01/28/11/24/sunflower-3113318_150.jpg"
        },
        {
            "largeImageURL":"https://pixabay.com/get/54e2dc464e51a814f6da8c7dda79367d1039dbe752576c48702972d09445c45dba_1280.jpg",
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            "id":2295434,
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            "comments":60,
            "pageURL":"https://pixabay.com/photos/spring-bird-bird-tit-spring-blue-2295434/",
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        },
        {
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            "pageURL":"https://pixabay.com/photos/sunflower-vase-vintage-retro-wall-3292932/",
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            "tags":"sunflower, vase, vintage",
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            "user":"Yuri_B",
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            "imageSize":2563708,
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            "userImageURL":"https://cdn.pixabay.com/user/2018/01/15/10-52-15-382_250x250.png",
            "previewURL":"https://cdn.pixabay.com/photo/2018/04/05/14/09/sunflower-3292932_150.jpg"
        },
        {
            "largeImageURL":"https://pixabay.com/get/51e1d0464e52b108f5d084609629347b133adce4554c704c73267fd79f4cc05a_1280.jpg",
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        },
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            "comments":37,
            "pageURL":"https://pixabay.com/photos/sunflower-flower-blossom-bloom-3540266/",
            "imageHeight":3760,
            "webformatURL":"https://pixabay.com/get/55e5d1434854aa14f6da8c7dda79367d1039dbe752576c48702972d09445c45dba_640.jpg",
            "type":"photo",
            "previewHeight":102,
            "tags":"sunflower, flower, blossom",
            "downloads":74877,
            "user":"pixel2013",
            "favorites":249,
            "imageSize":4179978,
            "previewWidth":150,
            "userImageURL":"https://cdn.pixabay.com/user/2019/07/15/18-51-07-612_250x250.jpg",
            "previewURL":"https://cdn.pixabay.com/photo/2018/07/15/19/02/sun-flower-3540266_150.jpg"
        },
        {
            "largeImageURL":"https://pixabay.com/get/57e3d44a4b53a814f6da8c7dda79367d1039dbe752576c48702972d09445c45dba_1280.jpg",
            "webformatHeight":426,
            "webformatWidth":640,
            "likes":288,
            "imageWidth":4272,
            "id":1319114,
            "user_id":485024,
            "views":99904,
            "comments":25,
            "pageURL":"https://pixabay.com/photos/girl-flowers-yellow-beauty-nature-1319114/",
            "imageHeight":2848,
            "webformatURL":"https://pixabay.com/get/57e3d44a4b53a814f6da8c7dda79367d1039dbe752576c48702972d09445c45dba_640.jpg",
            "type":"photo",
            "previewHeight":99,
            "tags":"girl, flowers, yellow",
            "downloads":48347,
            "user":"AdinaVoicu",
            "favorites":292,
            "imageSize":3837334,
            "previewWidth":150,
            "userImageURL":"https://cdn.pixabay.com/user/2019/07/18/16-54-09-399_250x250.jpg",
            "previewURL":"https://cdn.pixabay.com/photo/2016/04/09/23/10/girl-1319114_150.jpg"
        }
    ],
    "total":21247
}

最佳答案

问题是您的状态初始值是 data: ''，这是一个字符串值，在执行 this.state.data.hits[0] 时，它将在首次渲染期间抛出错误.

要解决此问题，您可以将初始状态更改为如下所示

    this.state = {
      input : '',
      data: {
        hits: []
      ,
      isloading: true
    }

建议:

您不需要绑定(bind)方法fetchData，因为它是在同一范围内调用的

如果你删除这个绑定(bind)，那么你甚至不需要构造函数，你可以用下面的代码替换整个构造函数

    state = {
      input : '',
      data: { hits: [] },
      isloading: true
    }

关于javascript - 为什么我无法访问状态中的嵌套数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58105122/

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javascript - 为什么我无法访问状态中的嵌套数据