Function recursiveFunction

src/utils/events.js:23–26

(e)

export function once (el, type, callback) {
  let typeArray = type.split(' ');
  let recursiveFunction = function(e){
    e.target.removeEventListener(e.type, recursiveFunction);
    return callback(e);
  };

  for (let i = typeArray.length - 1; i >= 0; i--) {
    on(el, typeArray[i], recursiveFunction);