javascript - What is the function of google.maps.event.addDomListener(window, 'load', initialize);? -

i trying google maps. found statement.

google.maps.event.adddomlistener(window, 'load', initialize); 

what function of statement ?

it adds listener window object, load event triggered (i.e. "the page has finished loading") executes function initialize.

i.e. delays google map related script until page has finished loading.