通过更改 API 数据来更改图标

Question

我想制作一个以天气为主题的网站。我在构建过程中讲到图标应该随着天气的变化而变化。

    let shiftIcon = () => {

        let icon = "";
        let iconText = data.date[0].weather.code;

        if (iconText == 600) {
            icon = "https://img.icons8.com/external-those-icons-lineal-color-those-icons/48/000000/external-wind-weather-those-icons-lineal-color-those-icons.png";
            return (
                <img src={icon} />
            );
        } else {
            return null;
        }
    }

   <div className="col col-3">
     {shiftIcon()}
 </div>

写完这段代码后，我得到了一个错误。您对此有解决方案吗？

TypeError: Cannot read properties of undefined (reading '0') shiftIcon E:/Projects and trainings/Education Courses/react.js courses/Person/weather-application/src/components/boxNew.js:32 29 | let shiftIcon = () => { 30 | 31 | let icon = ""

32 | let iconText = data.date[0].weather.code; | ^ 33 | 34 | if (iconText == 600) { 35 | icon = "https://img.icons8.com/external-those-icons-lineal-color-those-icons/48/000000/external-wind-weather-those-icons-lineal-color-those-icons.png";

Answer 1

最初 data 未定义。您应该使用 optional chaining 来消除运行时异常。

这样试试

let iconText = data?.date?.[0]?.weather?.code;

通过更改 API 数据来更改图标

Change the icon by changing the API data

javascript

reactjs

if-statement

icons