问题
I'm struggling for while trying to figure out how to increase a number based on a Date or based on a time (Using setInterval).
I don't know which option is easier. I made it by using setInterval:
HTML
<p class="counter"></p>
JS
let tickets = 35000;
const counter = document.querySelector('.counter');
let interval = setInterval(function(){
console.log(tickets);
if (tickets >= 60000) {
var textSoldOut = `<p>¡Todo vendido!</p>`;
counter.innerHTML = textSoldOut;
console.log("Sold out");
clearInterval(interval);
}else{
var text = `¡${tickets} tickets Sold!`;
contador.innerHTML = text;
console.log(text)
}
const random = Math.floor(Math.random()*(200-100+1)+100);
tickets += random;
}, 10000);
The thing is every time the page is refreshed the counter starts from 35000 again. I am trying to figure out how to storage the var tickets. I guess this would be made by using localStorage, but since I am a beginner in JS, I am not able to do it.
Other option would be by checking the date, and based on that, show a number:
function date() {
var d = new Date();
var month = d.getMonth();
var day = d.getDate();
const counter = document.querySelector('.contador');
const random = Math.floor(Math.random()*(200-100+1)+100);
for (let i = 350000; i <= 60000 ; i++) {
if (month == 0 & day == 28) {
var sum = i + random;
document.getElementById("contador").innerHTML = suma;
}else if (mes == 0 & dia == 30) {
...
} else if (...){
...
}
}
document.getElementById("dia").innerHTML = dia;
document.getElementById("mes").innerHTML = mes;
}
fecha();
Could someone help me out to reach the result? I would really appreciate it
回答1:
The Storage object accessible via the localStorage property offers two methods to save or retrieve data: setItem
and getItem()
.
Usage is quite simple. If you want to save the numbers of tickets into a myTickets key on localStorage you have to do it like this:
localStorage.setItem("myTickets", tickets);
To retrieve that data later on:
localStorage.getItem("myTickets");
You just have to make sure to update the myTickets key on localStorage as you increase the number of tickets inside the setinterval callback function.
let tickets = 35000;
if (localStorage.getItem("myTickets") == null) {
localStorage.setItem("myTickets", tickets);
} else {
tickets = localStorage.getItem("myTickets");
}
const counter = document.querySelector('.counter');
let interval = setInterval(function() {
console.log(tickets);
if (tickets >= 60000) {
var textSoldOut = `<p>¡Todo vendido!</p>`;
counter.innerHTML = textSoldOut;
console.log("Sold out");
clearInterval(interval);
} else {
var text = `¡${tickets} tickets Sold!`;
console.log(text)
}
const random = Math.floor(Math.random() * (200 - 100 + 1) + 100);
tickets += random;
localStorage.setItem("myTickets", tickets);
}, 10000);
来源:https://stackoverflow.com/questions/59950018/increase-a-number-based-on-date-or-interval-javascript-and-keep-it-after-refres