在2个seonds之后留下一个循环 [英] Leave a loop after 2 seonds

问题描述

我想在while循环中重复一段文字2秒钟。如何在2秒后打破循环？

I would like to repeat a text for 2 seconds in a while loop. How do I break the loop after 2 seconds?

这是我到目前为止所尝试的但不起作用：

This is what I have tried so far but it doesn't work:

var repeat = true;
setTimeout(function() { var repeat = false }, 2000)
while(repeat) {
    console.log("Let's repeat for 2 seconds...");
}

推荐答案

JavaScript是单线程的。这意味着只要你的循环运行，你的超时永远不会被触发。

JavaScript is single threaded. This means that as long as your loop runs, your timeout will never be fired.

取决于你想要什么以及你是否想要锁定你的浏览器（通过使用实际的无限循环），您可以使用 setInterval 作为循环，并使用 setTimeout 来停止间隔2秒后。

Depending on what you want and whether or not you want to lock down your browser (by using an actual infinite loop), you can use the setInterval as a loop, and use the setTimeout to stop the interval after 2 seconds.

console.log("Starting loop");

var interval = setInterval(function () {
    console.log("Let's repeat for 2 seconds...");
}, 0);

setTimeout(function() {
    clearInterval(interval);
    console.log("Finished loop");
}, 2000);

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