javascript 对大值使用 setTimeout()
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Using setTimeout() for large values
提问by SomeKittens
I'm trying to get an event to fire after five minutes. I'm using the following code:
我试图在五分钟后触发一个事件。我正在使用以下代码：
setTimeout(tweet(name, type), 5 * 60 * 1000);
It isfiring after a while, but not nearly five minutes (Usually two minutes or so, but sometimes it's instant.). What am I doing wrong? (I've also tried setting the time to 300000instead, same problem.
这是一段时间后射击，但不是将近五分钟（通常是两分钟左右，但有时它的即时）。我究竟做错了什么？（我也试过将时间设置为300000同样的问题。
回答by Quentin
You are calling tweetimmediately and passing its return value to setTimeout.
您正在tweet立即调用并将其返回值传递给setTimeout.
You need to pass a function to setTimeout. You haven't included the code for tweet, but I'm going to assume that it doesn't returna function.
您需要将函数传递给setTimeout. 您尚未包含 的代码tweet，但我假设它不是return函数。
setTimeout(function () { tweet(name, type); }, 5 * 60 * 1000);
回答by Florian Margaine
Quentin's solution works, but you can also use this form:
Quentin 的解决方案有效，但您也可以使用以下形式：
setTimeout(tweet(name, type), 5 * 60 * 1000);
function tweet(name, type) {
return function(name, type) {
};
}
It has some use cases when you want to keep some values in a closure.
当您想在闭包中保留某些值时，它有一些用例。
