Javascript: Increment count by 5 for a variable inside a setInterval() function

问题

I'm trying to use Google Analytics events to track time spent on site more accurately (without relying on delta time between visits to another page on site). I'm using setInterval() to continuously trigger that GA even every 5 seconds. How do I properly increment seconds elapsed to send along with the GA event data?

  var count = 0;
  setInterval(function(){
    // increment "count" by 5 each time setInterval is run
    ga('send', 'event', 'time', 'tracking', 'seconds', count);
  }, 5000);

回答1:

  var count = 0;
  setInterval(function(){
    // increment "count" by 5 each time setInterval is run
    count+=5; //is this what you need?
    ga('send', 'event', 'time', 'tracking', 'seconds', count);
  }, 5000);

回答2:

Is this what your looking for?

var count = 0;
setInterval(function(){
  count = count + 5;
  // increment "count" by 5 each time setInterval is run
  ga('send', 'event', 'time', 'tracking', 'seconds', count);
}, 5000);

回答3:

How about this?

var count = 0;
setInterval(function(){
    count+=5;
    // increment "count" by 5 each time setInterval is run
    ga('send', 'event', 'time', 'tracking', 'seconds', count);
}, 5000);

回答4:

Not sure if I gather this correctly, but we can do this like: var count = 0,interval=5000; setInterval(function(){ // increment "count" by 5 each time setInterval is run ga('send', 'event', 'time', 'tracking', 'seconds', count+interval); }, interval);

In clear interval you can set count = 0 again.

来源：https://stackoverflow.com/questions/21942872/javascript-increment-count-by-5-for-a-variable-inside-a-setinterval-function