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As we all know, Angular’s ??$interval method is

$interval(fn, delay, [count], [invokeApply], [Pass]);

It returns a promise, which is generally used to handle different stages. promise.then(success,error,notify)For example, I use $interval to define a clock and test it

            var timer = $interval(function(){
                 console.log('inner');
             },2000,2);

             timer.then(success, error, notify);
             function success(){
                 console.log('done');
             }

             function error(){
                 console.log('error');
             }

             function notify(){
                 console.log('everytime');

outputs
and inner at the same time every time. What is the difference between everytime's callback function $interval and promise's fn? notify