1. 获取选中项:
获取选中项的Value值:
$('select#sel option:selected').val();
$('select#sel').find('option:selected').val();
$('select#seloption:selected').text();
$('select#sel').find('option:selected').text();
$('select#sel').get(0).selectedIndex;
$('select#sel option:last').attr("index")
$('select#sel')[0].options.length;
$('select#sel').get(0).options.length;
$('select#sel option:first').attr('selected','true')
$('select#sel')[0].selectedIndex = 0;
$('select#sel option:last).attr('selected','true')
$('select#sel')[0].selectedIndex =索引值;索引值=0,1,2....
$('select#sel').attr('value','4');
$("select#sel option[value='4']").attr('selected', 'true');
$("select#sel option[value='3']").remove();
$(" select#sel option ").eq(索引值).remove();索引值=0,1,2....
$(" select#sel option ").eq(2).remove();
$(" select#sel option ").eq(0).remove();
$("select#sel option:first").remove();
$("select#sel option:last").remove();
$("select#sel").remove();
$("select#sel").append("<option value='6'>f</option>");
$("select#sel").prepend("<option value='0'>0</option>");
$(' select#sel option ').each(function (index, domEle) { //写入代码 });