I write some example code about $timeout
service.
var myModule = angular.module('timerTest',[]);
myModule.controller('counting',function($scope,$timeout)
{
var timerObject;
var count =0;
var countTime = function()
{
count++;
console.log(count);
$scope.value = count;
timerObject = $timeout(countTime,1000);
};
$scope.startTimer = function()
{
console.log('timer start!');
$timeout(countTime,1000);
};
$scope.endTimer = function()
{
console.log('End Timer');
$timeout.cancel(timerObject);
};
});
In that code at countTime
function, when I wrote
timerObject = > $timeout(countTime(),1000);
It calls countTime()
very fast so It will make callstack overflow.
But when I wrote
timerObject = $timeout(countTime,1000);
It works perfectly. Is any different from that?
timerObject = $timeout(countTime(),1000)
immediately calls countTime
on that line, and passing the result of this into $timeout
. Whenever you put parentheses after a function name, it means you're calling the function right there and then - since you're doing this in every iteration of your function, it's causing it to endlessly repeat, hence the stack overflow.
timerObject = $timeout(countTime,1000)
, on the other hand, passes the countTime
function itself into $timeout
- this is the correct way to use the service, and will cause $timeout
to call countTime
after approximately 1000 milliseconds.
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