(function($){
var lazerCharging = false,
lazerChargeTime = 500; // Charge time in ms
function handleKeyPress(e){
if(e.keyCode == 32){
shoot(lazerChargeTime);
}
}
function shoot(chargeTime){
if(!lazerCharging){
lazerCharging = true;
$("body").append("pew<br/>");
setTimeout(function(){
lazerCharging = false;
}, chargeTime)
}
}
$(window).on("keydown", handleKeyPress);
})($);
Here's a jsfiddle