IE VS NETSCAPE[17]

26

给下来框新增一个option

var newopt =new option(text,value,false,false); select.options[select.options.length] = newopt;

var ooption = document.createelement("option"); ooption.text="" ; ooption.value=""; select.add(ooption);

27

删除下拉框的某个option

 select.options[i] = null;

select.options[i] = null;

select.options.remove(i);