How does the triggering of mousemove work in Javascript?
I have an object that prints the mouse's x and y positions on every mousemove.
It's something like this:
$('#canvas').mousemove(function(e){
$('#output').prepend(e.pageX + ',' + e.pageY);
});
I've noticed that when you move over the object really fast it only prints out a few positions.
I'm not exactly unhappy that it does that (because it would be quite exhaustive to have it do something for all the hundreds of pixels you've crossed) but I am wondering how this works.
Is the mousemove event limited to a certain amount of triggers per second or what?
(Btw: this was tested on Chromium in Ubuntu Linux)
“小鼠只能每秒n次向操作系统报告自己的位置，我认为n通常小于100”
You may want to look at this, as this may be browser dependent,
http://javascript.info/tutorial/mouse-events#mousemove-and-mouseover-frequency, but, if you look at this question, there is a suggestion on how to get better response.
How to set mousemove update speed?
i think it's synchronous. It's doesn't get triggered for every pixel in which you move your mouse, which means that the events are not queued up .
Say if you have some some code like this.
$('#canvas').mousemove(function(e){
//Some code which takes seconds to execute
//All subsequent events won't be dispatched while this event handler is executing.
});
Say if you move mouse while the mouse move event handlers execute. The mousemove handler won't be triggered.
Here is a example for handler which will take seconds to execute. --> http://jsfiddle.net/78Hf3/1/
And one that take only few time --> http://jsfiddle.net/78Hf3/2/
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