问题
I have a jsFiddle here: http://jsfiddle.net/dztGA/22/
The goal: Essentially, I'm trying to have 2 discrete timers on the same page that can be destroyed and re-created on mouseover/mouseout (pause), or on manual progression (restart).
The problem: What my jsFiddle's single timer will illustrate is that when I click "Stop Timer", my setInterval (stored in variable t) seems to have multiple instances albeit being destroyed with clearInterval(t). This becomes apparent when I click "Restart Timer" and it seems to have 2+ independent timers as illustrated by the quick increment.
A caveat: I have done as much research on SO as I can, but because I'll be having 2 different sliders on the page, I can't use any "clear all timers" methods, so I tried storing each in a variable.
I hope that's clear. Thanks for the view.
回答1:
To fix your current issue: Add clearInterval(window.t)
at the onclick
function of the reset button.
A method to be able to have multiple timers. This requires a certain structure, though.
Fiddle (6 timers!): http://jsfiddle.net/dztGA/27/
(function(){ //Anonymous function, to not leak variables to the global scope
var defaultSpeed = 3000; //Used when missing
var timerSpeed = [500, 1000, 2000, 4000, 8000];
var intervals = [];
function increase(i){
return function(){
var elem = $("#count"+i);
elem.text(parseFloat(elem.text()) + 1);
}
}
function clear(i){
return function(){
clearInterval(intervals[i]);
}
}
function restart(i){ //Start AND restart
return function(){
clear(i)();
increase(i)();
intervals[i] = setInterval(increase(i), timerSpeed[i]||defaultSpeed);
}
}
// Manual increment
$('input[name=increment]').each(function(i){
$(this).click(function(){
restart(i)();
increase(i)();
});
});
// Clear timer on "Clear"
$('input[name=clear]').each(function(i) {
$(this).click(clear(i));
});
// Restart timer on "Restart"
$('input[name=reset]').each(function(i) {
$(this).click(restart(i));
//Optionally, activate each timer:
increase(i)();
});
})();
回答2:
// Clear timer on "Clear"
$('input[name=clear]').click(function() {
window.clearInterval(t);
});
should be
// Clear timer on "Clear"
$('input[name=clear]').click(function() {
window.clearInterval(window.t);
});
because this
is the input not Window
来源:https://stackoverflow.com/questions/7732009/using-multiple-instances-of-setinterval