Function on

external/.scrollLibs.js:1936–1945

(emitter, type, f)

  var noHandlers = []

  var on = function (emitter, type, f) {
    if (emitter.addEventListener) {
      emitter.addEventListener(type, f, false)
    } else if (emitter.attachEvent) {
      emitter.attachEvent("on" + type, f)
    } else {
      var map$$1 = emitter._handlers || (emitter._handlers = {})
      map$$1[type] = (map$$1[type] || noHandlers).concat(f)
    }
  }

  function getHandlers(emitter, type) {
    return (emitter._handlers && emitter._handlers[type]) || noHandlers