我的 React 组件有问题。问题是当我想获得当前的地理坐标时,我获得了 4 次。如果我将它们提交到服务器,同样的问题仍然存在。浏览器发出 4 个相同的请求,而不是一个。可能有什么问题?这是我的组件的完整代码:
import React from "react";
export const Component = (): JSX.Element => {
const getCoords = async (): Promise<GeolocationPosition> => {
return new Promise((resolve, reject) => {
navigator.geolocation.getCurrentPosition(
(position: GeolocationPosition) => resolve(position),
(error) => reject(error)
);
});
};
const getData = async () => {
const { latitude, longitude } = (await getCoords()).coords;
console.log(latitude + " " + longitude);
const response = await fetch(`URL`);
const result = await response.json();
console.log(result);
};
getData();
return (
<div>
<h1>Hello</h1>
</div>
);
};
答案 0 :(得分:1)
你不应该在 body ò 函数组件中调用 API。您应该在 getData
中调用 useEffect
:
useEffect(() => {
const getCoords = async (): Promise<GeolocationPosition> => {
return new Promise((resolve, reject) => {
navigator.geolocation.getCurrentPosition(
(position: GeolocationPosition) => resolve(position),
(error) => reject(error)
);
});
};
const getData = async () => {
const { latitude, longitude } = (await getCoords()).coords;
console.log(latitude + " " + longitude);
const response = await fetch(`URL`);
const result = await response.json();
console.log(result);
};
getData();
}, []);