var select = document.getElementById('select').options[
document.getElementById('select').selectedIndex].innerHTML;var term = document.getElementById('term').value;//用String.indexOf比较简单
alert(select.indexOf(term) == -1);
//用RegExp 正则表达式对象
var re = new RegExp(select);alert(re.search(term));
document.getElementById('select').selectedIndex].innerHTML;var term = document.getElementById('term').value;//用String.indexOf比较简单
alert(select.indexOf(term) == -1);
//用RegExp 正则表达式对象
var re = new RegExp(select);alert(re.search(term));
{
var option = document.getElementById('select').options[i].innerHTML;
alert(select.indexOf(option) == -1);
}
alert(option.indexOf(term) == -1);