javascript reactjs react-hooks use-state 假设以下示例:const example = () => { const [objects, setObjects] = useState([]) const asyncFunction = async() => { // This will trigger the API and assume it takes around 10 seconds to run let result = api.fetchObjects().then((result) =>...
我的初始状态如下所示: var DynamicForm = React.createClass({ getInitialState: function() { var items = {}; items[1] = { name: 'field 1', populate_at: 'web_start', same_as: 'customer_name', autocomplete_from: 'customer_name', title: '' }; items[2] = { name: 'field 2', po...
相反，ReactpreviousState通过传递一个接受先前状态作为第一个参数的函数来提供，例如// generalthis.setS...
React components can, and often do, havestate. State can be anything, but think of things like whether a user is logged in or not and displaying the correct username based on which account is active. Or an array of blog posts. Or if a modal is open or not and which tab within it ...
It might be desirable to haveReactas the single source of truth within your app and after doing so you can then fall back on option 2 invokingsetHasFocusright after your firstsetState. Options 2.2: reintroduce the setState callback by yourself. ...
This way the setState's callback is idempotent and even if React calls it more than once, it will lead to the correct state. lmorchardmentioned this issueJan 27, 2021 fixes #4371 feat(nimbus): add documentation add/remove functionalitymozilla/experimenter#4480 ...
import React, { Component } from "react";import axios from "axios";import ReactPlayer from "...