绑定相应的事件的元素，例如

Bind the appropriate events to the element, e.g.

el.addEventListener("animationstart", function() {}, false);
el.addEventListener("animationend", function() {}, false);
el.addEventListener("animationiteration", function() {}, false);

https://developer.mozilla.org/en-US/docs/CSS/Tutorials/Using_CSS_animations#Using_animation_events

请注意：您可能需要添加相应的prefixed事件为好，例如 webkitAnimationEnd

Note: You may need to add the appropriate prefixed-events as well, e.g. webkitAnimationEnd