[英]For loop with different json variable display all items instead one each
[英]Display three different color/text in one by one in each visit and in loop
if(localStorage.getItem("attempts")==1) {
//Show Red color
alert('1')
}
if(localStorage.getItem("attempts")==2) {
//Show Black color
alert('2')
}
if(localStorage.getItem("attempts")==3) {
//Show white color
alert('3')
}
var attempts = Number(localStorage.getItem("attempts"));
localStorage.setItem("attempts", ++attempts);console.log(attempts);
也许像下面的例子? 您将需要通过添加本地存储来调整它。
let clicks = 0; let element = document.getElementById('color'); let btn = document.getElementById('clickbtn'); btn.addEventListener('click', () => { clicks++; switch (clicks) { case 1: element.style.color = 'red'; break; case 2: element.style.color = 'green'; break; case 3: element.style.color = 'blue'; break; } if (clicks == 3) clicks = 0; });
<button id="clickbtn">Click</button> <p id="color">color element</p>
window.addEventListener('load', () => { if (!localStorage.getItem('attempts')) { localStorage.setItem('attempts', 0) } else { let fetchedAttempts = parseInt(localStorage.getItem('attempts')) fetchedAttempts++ localStorage.setItem('attempts', fetchedAttempts) } }) document.addEventListener('DOMContentLoaded', () => { let attemptsCount = parseInt(localStorage.getItem('attempts')) if (attemptsCount % 3 === 1) { document.body.style.backgroundColor = 'red' } else if (attemptsCount % 3 === 2) { document.body.style.backgroundColor = 'black' } else if (attemptsCount % 3 == 0) { document.body.style.backgroundColor = 'white' } })
正如我在评论中提到的,您的比较有误。 您使用单个 =(赋值)而不是 == 或 === 比较。
为了循环通过您的 colors 同时仍然计数请求,使用模运算符: %
这计算除法后的余数。 例如7 % 3
计算 7 除以 3 后的余数,即 1。
这样您就可以根据您部门的 rest 进行计数并更改颜色,该分区始终为 0、1 或 2
let count = 0
window.addEventListener("load", () => {
if (!localStorage.getItem("count")) {
localStorage.setItem("count", count);
} else {
let fetchedCount = parseInt(localStorage.getItem("count"));
fetchedCount++;
localStorage.setItem("count", fetchedCount);
}
});
document.addEventListener("DOMContentLoaded", () => {
let visitingCount = parseInt(localStorage.getItem("count"));
if (visitingCount % 3 === 1) {
document.body.style.backgroundColor = "red";
} else if (visitingCount % 3 === 2) {
document.body.style.backgroundColor = "black";
} else if (visitingCount % 3 == 0) {
document.body.style.backgroundColor = "white";
}
});
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