Javascript 销毁之前的 setInterval
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Destroy previous setInterval
提问by Eric Fortis
I want a function to set an Ajax and a reload timer. The code below doesn't destroy the previous function call timer, so each time I invoke it I get another timer. How can I destroy the previous timer?
我想要一个函数来设置 Ajax 和重新加载计时器。下面的代码不会破坏之前的函数调用计时器，所以每次调用它时我都会得到另一个计时器。如何销毁以前的计时器？
function initNowPlayingMeta(station) {
$('#cancion').children().remove();
$('#cancion').load('sonando.php?emisora=' + station);
var prevNowPlaying = setInterval(function () {
$('#cancion').load('sonando.php?emisora=' + station);
}, 5000);
}
回答by Kyle Wild
You need to store your timer reference somewhere outside of local scope (this essentially means declaring it with varoutside of the function). Then, clear it with clearInterval:
您需要将计时器引用存储在本地范围之外的某处（这实际上意味着var在函数外部声明它）。然后，使用以下命令清除它clearInterval：
var prevNowPlaying = null;
function initNowPlayingMeta(station) {
if(prevNowPlaying) {
clearInterval(prevNowPlaying);
}
$('#cancion').children().remove();
$('#cancion').load('sonando.php?emisora=' + station);
prevNowPlaying = setInterval(function () {
$('#cancion').load('sonando.php?emisora=' + station);
}, 5000);
}
回答by tobyodavies
clearInterval(prevNowPlaying);
clearInterval(prevNowPlaying);
you will also want to make the prevNowPlaying from previous calls in scope whereever you try to cancel
您还需要在尝试取消的范围内从以前的调用中进行 prevNowPlaying
回答by gsnedders
You need to explicitly clear the timer.
您需要明确清除计时器。
var prevNowPlaying;
function initNowPlayingMeta(station) {
$('#cancion').children().remove();
$('#cancion').load('sonando.php?emisora=' + station);
if (prevNowPlaying === undefined) clearInterval(prevNowPlaying);
prevNowPlaying = setInterval(function () {
$('#cancion').load('sonando.php?emisora=' + station);
}, 5000);
}
