取下拉菜单的值，语句怎么写？

Question

value:
sel.value
sel[sel.selectedIndex].valuetext:
sel[sel.selectedIndex].text
sel[sel.selectedIndex].innerText

Answer 1

document.all("listbox1").options[document.all("listbox1").selectedIndex].value
document.all("listbox1").options[document.all("listbox1").selectedIndex].text

Answer 2

document.all(selectName).options[selectedIndex].valueselectName  是下拉菜單的名字

Answer 3

value:
sel.valuetext:
sel(selectedIndex).text

Answer 4

document.all(name).options[selectedIndex].value

Answer 5

sel.options[sel.selectedIndex].value
sel.options[sel.selectedIndex].text