Reactjs 如何接收React.lazy()、暂挂值并将其添加到状态变量号
在下面的示例中,我们如何使用Reactjs 如何接收React.lazy()、暂挂值并将其添加到状态变量号,reactjs,react-hooks,react-suspense,Reactjs,React Hooks,React Suspense,在下面的示例中,我们如何使用React.lazy()和suspend。我从FirstComponent.js获取随机值。如何使用FirstComponent值添加到newNumber并显示总数。因此,在每次渲染时,我们应该根据接收到的随机值获得不同的总数。可能吗 SecondComponent.js import React, { useState, useEffect } from "react"; const FirstComponent = () => {
React.lazy()
和suspend
。我从FirstComponent.js
获取随机值。如何使用FirstComponent值添加到newNumber
并显示总数。因此,在每次渲染时,我们应该根据接收到的随机值获得不同的总数。可能吗
SecondComponent.js
import React, { useState, useEffect } from "react";
const FirstComponent = () => {
const [numbers, setNumbers] = useState("");
useEffect(() => {
const randomNumber = [];
const data = [10, 20, 30, 40, 50, 60];
const random = Math.floor(Math.random() * data.length);
randomNumber.push(data[random]);
setNumbers(randomNumber);
}, []);
return <div>Hello First: {numbers}</div>;
};
export default FirstComponent;
import React from "react";
const SecondComponent = () => {
return <div>Hello Second</div>;
};
export default SecondComponent;
从“React”导入React;
const SecondComponent=()=>{
第二回你好;
};
导出默认组件;
您需要传递回调,如所示
const FirstComponent=React.lazy(()=>import(“./other/FirstComponent”);
导出默认函数App(){
const[newNumber,setNewNumber]=useState(0);
常量[randomNumber,setRandomNumber]=useState(0);
useffect(()=>{
setNewNumber(100);
}, []);
返回(
{newNumber+randomNumber}
);
}
常量FirstComponent=({set})=>{
const[number,setNumber]=useState(0);
useffect(()=>{
常数随机数=数据[随机];
setNumber(随机数);
集合(随机数);
},[集];
返回随机数:{Number};
};
import React from "react";
const SecondComponent = () => {
return <div>Hello Second</div>;
};
export default SecondComponent;
const FirstComponent = React.lazy(() => import("./other/FirstComponent"));
export default function App() {
const [newNumber, setNewNumber] = useState(0);
const [randomNumber, setRandomNumber] = useState(0);
useEffect(() => {
setNewNumber(100);
}, []);
return (
<div>
<Suspense fallback={<div>Loading...</div>}>
<FirstComponent set={setRandomNumber} />
{newNumber + randomNumber}
</Suspense>
</div>
);
}
const FirstComponent = ({ set }) => {
const [number, setNumber] = useState(0);
useEffect(() => {
const randomNumber = data[random];
setNumber(randomNumber);
set(randomNumber);
}, [set]);
return <div>Random Number: {number}</div>;
};