for of cycle no work inside jsdom

[yuniers]

I'm a scraping a web site and must obtain the option value of and html select element. I want do, but no work

var document = window.document
var selecFacultades = document.getElementById('ctlHeader_cmbListaFacultades')
var facultades = []
for ( var facultad of selecFacultades.children ) {
    facultades.push( facultad.value )
}

finally I must done on this way whit a for

var document = window.document
var selecFacultades = document.getElementById('ctlHeader_cmbListaFacultades')
var facultades = []
for ( var i = 0; i < selecFacultades.length - 1; i++ ) {
    facultades.push( selecFacultades.options[i].value )
}

Can any say to me why not work?