whole_func_string: function on (el, types, fn, context) {
    types.split(' ').forEach(function (type) {
      L.DomEvent.on(el, type, fn, context)
    })
  }
func_code_string: function on (el, types, fn, context) {
    types.split(' ').forEach(function (type) {
      L.DomEvent.on(el, type, fn, context)
    })
  }
func_documentation_string: Leaflet v0.7 backwards compatibility