Question

我有一个setTimeout函数，如下所示。

setTimeout(function(){gameEngine(radioValue,height,width,gameLevel)}, 1500);

我使用了以下clearTimeout格式，但那不起作用。怎么了？

clearTimeout(gameEngine(radioValue,height,width,gameLevel));

Answer 1

setTimeout函数返回一个ID，您可以将其传递给clearTimeout函数以停止计时器。

let gameTimer = setTimeout(function(){...}, 1500);

现在，无论何时您想停止计时器，都调用clearTimeOut方法并将其传递给您的计时器ID。

clearTimeout(gameTimer);

Answer 2

您需要将@IBAction func usdConversions(_ sender: Any) { self.displayAlert("Alert!", message: "USD Selected") let usdVal = (outputCurrency1.text! as NSString).floatValue let euroValue = usdVal * (usdtoeurquote["5. Exchange Rate"] as! Float) outputCurrency2.text = String(format: "%.2f", euroValue) let gbpVal = usdVal * (usdtogbpquote["5. Exchange Rate"] as! Float) outputCurrency3.text = String(format: "%.2f", gbpVal) let cnyVal = usdVal * (usdtocnyquote["5. Exchange Rate"] as! Float) outputCurrency2.text = String(format: "%.2f", cnyVal) let cadVal = usdVal * (usdtocadquote["5. Exchange Rate"] as! Float) outputCurrency2.text = String(format: "%.2f", cadVal) let inrVal = usdVal * (usdtoinrquote["5. Exchange Rate"] as! Float) outputCurrency2.text = String(format: "%.2f", inrVal) let sekVal = usdVal * (usdtosekquote["5. Exchange Rate"] as! Float) outputCurrency2.text = String(format: "%.2f", sekVal) let rubVal = usdVal * (usdtorubquote["5. Exchange Rate"] as! Float) outputCurrency2.text = String(format: "%.2f", rubVal) let nzdVal = usdVal * (usdtonzdquote["5. Exchange Rate"] as! Float) outputCurrency2.text = String(format: "%.2f", nzdVal) }函数存储在变量中（例如x）当您想setTimeOut时，使用参数x进行调用。例如：

cleartimeout

var timeoutID;

function delayedAlert() {
  timeoutID = window.setTimeout(slowAlert, 10000);
}

function slowAlert() {
  alert("That was really slow!");
}

function clearAlert() {
  window.clearTimeout(timeoutID);
}

根据您的情况：

<p>Live Example</p>
<button onclick="delayedAlert();">Show an alert box after 10 seconds</button>
<p></p>
<button onclick="clearAlert();">Cancel alert before it happens</button>

我有一个setTimeout函数，如何使用cleartimeout函数停止此循环

2 个答案: