Question

所以我有这个代码

function timer()
{
     setTimeout(function(){alert("Out of time")}, 3000); //Alerts "Out of time" after 3000 milliseconds
}
function resetTime()
{
     timer(); //this is not right, i thought it would override the first function but it just adds another timer as well which is not what I want
}
function stopTime()
{
     //What could go here to stop the first function from fully executing before it hits 3000 milliseconds and displays the alert message?
}

函数timer（）在页面加载时启动但是如果我有一个stopTime（）按钮并且我点击它，我如何停止执行第一个函数并阻止它达到3000毫秒标记并提醒＆＃34;超时＆＃34;？

Answer 1

使用范围超过所有功能的变量。

var myTimer;
...
myTimer = setTimeout(...);
...
clearTimeout(myTimer);

Answer 2

var timer;

function timer()
{
    timer = setTimeout(function(){alert("Out of time")}, 3000); //Alerts "Out of time" after 3000 milliseconds
}
function resetTime()
{
    clearTimeout(timer);
     timer(); //this is not right, i thought it would override the first function but it just adds another timer as well which is not what I want
}
function stopTime()
{
     //What could go here to stop the first function from fully executing before it hits 3000 milliseconds and displays the alert message?
}

试试这个会对你有用

Answer 3

setTimeout返回的值是一个唯一ID，您可以稍后使用该clearTimeout来取消超时。

var timeout;

function timer () {
    timeout = setTimeout(/* ... */);
}

function resetTime() {
    stopTime();
    timer();
}

function stopTime() {
    clearTimeout(timeout);
}

如何用另一个函数javascript停止计时器

3 个答案: