英文:
Calling a function as many times as possible in a given time interval
问题
我正在尝试在给定的时间间隔内尽可能多次地调用函数 test()。
这里该函数应该运行15秒。
function test(): void; // 仅类型定义
function run() {
return new Promise(resolve => {
setTimeout(() => {
resolve();
}, 15000); // 15秒
while (true) {
test();
}
});
}
run()
.then(() => {
console.log('结束');
});
然而，该函数不会停止运行，并且 结束 的控制台日志不会出现（显然 Promise 没有被解决）。在JavaScript中是否有实现这个的方法？
我在想，我可能可以使用控制台计时器，并将条件放在 while 语句中？（但这是最好的方法吗？）
英文:
I am trying to call the function test() as many times as possible in a given time interval.
Here the function should be running for 15 seconds.
function test(): void; // Only type def
function run() {
return new Promise(resolve => {
setTimeout(() => {
resolve();
}, 15000); // 15 seconds
while (true) {
test();
}
});
}
run()
.then(() => {
console.log('Ended');
});
However, the function doesn't stop running, and the Ended console.log does not appear. (Promise not resolved obviously). Is there a way to achieve this in Javascript ?
I was wondering, I could probably use console timers and put the condition in the while statement ? (But is that the best way ?)
答案1
得分: 1
您的功能无法停止执行的原因是，解决Promise不会停止脚本执行。您想要的是在您的run()方法中的某处存储一个标志，以便在意图解决Promise时可以翻转该标志。
请参阅下面的概念验证：我将周期缩短为1.5秒，并添加了一个虚拟的test()方法，仅供说明目的：
let i = 0;
function test() {
console.log(`test: ${i++}`);
}
function run() {
return new Promise(resolve => {
let shouldInvoke = true;
setTimeout(() => {
shouldInvoke = false;
resolve();
}, 1500); // 1.5秒
const timer = setInterval(() => {
if (shouldInvoke)
test();
else
window.clearInterval(timer);
}, 0);
});
}
run()
.then(() => {
console.log('结束');
});
请注意，这是一个示例代码，用于说明如何停止执行Promise后的操作。
英文:
The reason why your function does not stop executing is because resolving a promise does not stop script executing. What you want is to store a flag somewhere in your run() method, so that you can flip the flag once the promise is intended to be resolved.
See proof-of-concept below: I've shortened the period to 1.5s and added a dummy test() method just for illustration purpose:
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
let i = 0;
function test() {
console.log(`test: ${i++}`);
}
function run() {
return new Promise(resolve => {
let shouldInvoke = true;
setTimeout(() => {
shouldInvoke = false;
resolve();
}, 1500); // 15 seconds
const timer = setInterval(() => {
if (shouldInvoke)
test();
else
window.clearInterval(timer);
}, 0);
});
}
run()
.then(() => {
console.log('Ended');
});
<!-- end snippet -->
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