英文:
Keep checking if a function returns true in local storage
问题
I'm trying to check if a function returns true in an if/else statement, however I want to keep checking if the function returns true and when it does to execute the code...
我试图在if/else语句中检查函数是否返回true，但我想要持续检查函数是否返回true，当它返回true时执行代码...
How would I go about this? I have tried setInterval and setTimeout and it won't repeat, unless I'm missing something...
我应该如何做到这一点？我尝试过setInterval和setTimeout，但它不会重复，除非我漏掉了什么...
I have also tried a while loop but this is inefficient and crashes the browser...
我还尝试过使用while循环，但这是低效的，并且会导致浏览器崩溃...
However if I use an setInterval() how would I clear it once x returns true?
但如果我使用setInterval()，一旦x返回true，我该如何清除它？
Here is a snippet of my code for an example.
以下是我的示例代码片段。
function x() {
if (localStorage.getItem("a") === null) {
return false;
} else {
return true;
}
}
if (!x()) {
console.log("Returned True!");
update();
} else {
console.log("False");
}
英文:
I'm trying to check if a function returns true in an if/else statement, however I want to keep checking if the function returns true and when it does to execute the code...
How would I go about this? I have tried setInterval and setTimeout and it won't repeat, unless I'm missing something...
I have also tried a while loop but this is inefficient and crashes the browser...
However if I use an setInterval() how would I clear it once x returns true?
Here is a snippet of my code for an example.
function x() {
if (localStorage.getItem("a") === null) {
return false;
} else {
return true;
}
}
if (!x()) {
console.log("Returned True!");
update();
} else {
console.log("False");
}
答案1
得分: 1
setInterval() 应该可以工作。
function x() {
return localStorage.getItem("a") !== null;
}
let interval = setInterval(() => {
if (x()) {
console.log("Returned True!");
update();
clearInterval(interval);
} else {
console.log("False");
}
}, 500);
英文:
setInterval() should work
function x() {
return localStorage.getItem("a") !== null;
}
let interval = setInterval(() => {
if (x()) {
console.log("Returned True!");
update();
clearInterval(interval);
} else {
console.log("False");
}
}, 500);
答案2
得分: 0
function x() {
if (localStorage.getItem("a") === null) {
return false;
} else {
return true;
}
}
setInterval(x(), 1000);
setInterval(x, 1000);
第一个将在第二个清除之前运行一次。
英文:
Are you calling your function in the interval like x() or x?
function x() {
if (localStorage.getItem("a") === null) {
return false;
} else {
return true;
}
}
setInterval(x(), 1000);
setInterval(x, 1000);
The first will run once the second till you clear it
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