如何检查对象是否包含字符串值？

Posted 2021-03-19

我知道可以在h标签被填充时读取对象内部的值，但我不能打语句检查。response.image 的值，尽管我的 console.log 显示它确实存在。

我不确定下面的检查值的语义是否正确。我推测我可能需要在return语句之前进行检查。点击 response.result.image 是很好的，但我猜测这是因为我没有像上面的其他2条语句那样检查字符串值。

import React from 'react';
import getResponse from '../Handler/getResponse.jsx';
import Spinner from '../Spinner/Spinner.jsx';

import './Modal.css';

 const Modal = ({close, item}) => {
    const response = getResponse(item);
    console.log(response);

    return (
        <div>
           {response === null &&(<Spinner/>)}
            {response &&(
                <div className='modal'>
                <div className='popup'>
                    <h1>{response.result.name}</h1>
                    <h5>{response.result.description}</h5>
                    {(response.image === "Error") &&(
                        <p className="text">{response.result.detailedDescription.articleBody}</p>
                    )}
                   {response.image && (response.image !== "Error") &&(
                     <div className="container">
                                <div className="left">{response.result.detailedDescription.articleBody}</div>
                        <div className="right"><img className="image" alt="image" src={response.image}/></div>
                     </div>
                   )}
                   {response.result.image &&(
                     <div className="container">
                        <div className="left">{response.result.detailedDescription.articleBody}</div>
                        <div className="right"><img className="image" alt="image" src={response.result.image.contentUrl}/></div>
                     </div>
                   )}
                   <button onClick={ () => { close(false) }}>close me</button>
                </div>
              </div>
            )}
        </div>
   );
}

export default Modal;

答案

你可以试试这个我想你的响应中忘记了数据键，但我不能确定，因为我没有getResponse()函数？

import React from 'react';
import getResponse from '../Handler/getResponse.jsx';
import Spinner from '../Spinner/Spinner.jsx';

import './Modal.css';

 const Modal = ({close, item}) => {
    const r = getResponse(item);
    const response = r.data;

    console.log(response);


    // You can check if it is string with this one;
   if (typeof response.image === 'String' && response.image !== '') {
     console.log('String exists and is not empty')
   }

    return (
        <div>
           {response === null &&(<Spinner/>)}
            {response &&(
                <div className='modal'>
                <div className='popup'>
                    <h1>{response.result.name}</h1>
                    <h5>{response.result.description}</h5>
                    {(response.image === "Error") &&(
                        <p className="text">{response.result.detailedDescription.articleBody}</p>
                    )}
                   {response.image && (response.image !== "Error") &&(
                     <div className="container">
                                <div className="left">{response.result.detailedDescription.articleBody}</div>
                        <div className="right"><img className="image" alt="image" src={response.image}/></div>
                     </div>
                   )}
                   {response.result.image &&(
                     <div className="container">
                        <div className="left">{response.result.detailedDescription.articleBody}</div>
                        <div className="right"><img className="image" alt="image" src={response.result.image.contentUrl}/></div>
                     </div>
                   )}
                   <button onClick={ () => { close(false) }}>close me</button>
                </div>
              </div>
            )}
        </div>
   );
}

export default Modal;