setinterval

问题 let updateTimer: number; export function Timer() { const [count, setCount] = React.useState<number>(0); const [messages, setMessages] = React.useState<string[]>([]); const start = () => { updateTimer = setInterval(() => { const m = [...messages]; m.push("called"); setMessages(m); setCount(count + 1); }, 1000); }; const stop = () => { clearInterval(updateTimer); }; return ( <> <div>{count}</div> <button onClick={start}>Start</button> <button onClick={stop}>Stop</button> {messages.map((message,

问题 let updateTimer: number; export function Timer() { const [count, setCount] = React.useState<number>(0); const [messages, setMessages] = React.useState<string[]>([]); const start = () => { updateTimer = setInterval(() => { const m = [...messages]; m.push("called"); setMessages(m); setCount(count + 1); }, 1000); }; const stop = () => { clearInterval(updateTimer); }; return ( <> <div>{count}</div> <button onClick={start}>Start</button> <button onClick={stop}>Stop</button> {messages.map((message,

问题 My application places bets on certain sporting events. Almost like an automatic betting bot. A part of this is to track the current status of the event so it can make an informed calculation whether to place a bet or not. To do this, I poll the status of an event every minute using setInterval . A single sporting event is "watched" by 1 child process. There could be up 100+ sporting events at any one time meaning there could be 100+ child process' spawned & actively polling. worker/index.js

问题 I'm trying to code a function node in node-red which will give output as increasing numbers by 1 for every second when get msg.paylaod true from inject node and stop when get msg.payload "false" from another inject node. it starts giving output but don't stop when payload "false" is injected. Node code: [ { "id":"b6c9b219.90a478", "type":"function", "z":"a3d6aff.bd4935", "name":"", "func":"var i = 1;\nfunction increment(){\n i = i + 1;\n msg={payload:i};\n node.send(msg);\n \n}\nif(msg

问题 I have been stuck with this problem for quite some time now and i have searched on Google for countless hours to come up with a solution but to no avail. Here is my Problem I want to know the Logic behind a Carousel and would like to make it slide from right to left or vice-versa when a user hovers on the respective buttons. How can i make it animate continuously on mouseenter? Any help would be deeply appreciated. Thank You :) Here is the JSFIDDLE: http://jsfiddle.net/neoragex/qXseV/ 回答1: I

问题 I'm using setInterval inside an iframe, and I need to be able to stop it from the parent window, and it doesn't seem to be working. I'm assigning a global variable ('modelViewRefresh') to the setInterval event to be accessed from the parent. I'm using this code in the parent to try and trigger clearInterval, but it doesn't seem to be working: var modelViewRefresh = document.getElementById(widget_id + '_iframe').contentWindow['modelViewRefresh']; console.log("modelViewRefresh=" +

问题 I'm going to introduce my question in two steps with slightly different code blocks in both. Step 1: Below we have a React application which renders itself every two seconds and therefore causes the browser to print render to the console. If the user presses any key, the renders will stop which in turn stops the console prints. Please ignore the line commented out for now. import { useState, useEffect, useRef } from 'react'; function App() { const [number, setUpdate] = useState(0); const

问题 I have this very simple app, where I am trying to implement countdown, Start and Stop functionality seems to be working fine but when I press Stop , the value of seconds is not updating in the view which is desired behaviour but when I observed console log, it it showing the value of sec continuously changing which I guess shows that setInterval is still running and not cleared. Here is the accompanied code: import React, { useState, useEffect } from "react"; import { StyleSheet, Text, View,

问题 I am practicing React useState hooks to make a quiz timer that resets every ten seconds. What I have now is updating the state each second, and the p tag renders accordingly. But when I console.log(seconds) it shows 10 every time, and so the condition (seconds === 0) is never met . In Chrome's React DevTools, the state is updating accordingly as well. What am I doing wrong here? import React, {useState } from 'react'; function App() { const [seconds, setSeconds] = useState(10); const

问题 I am practicing React useState hooks to make a quiz timer that resets every ten seconds. What I have now is updating the state each second, and the p tag renders accordingly. But when I console.log(seconds) it shows 10 every time, and so the condition (seconds === 0) is never met . In Chrome's React DevTools, the state is updating accordingly as well. What am I doing wrong here? import React, {useState } from 'react'; function App() { const [seconds, setSeconds] = useState(10); const