js:设置选定索引的option被选中,可应用于重置选择框
首先获取DOM对象(也就是select元素)
var select = document.getElementById("xxx");
select[selectedIndex].selected = true
jquery:
var selected = $("#selectName option:selected")
var firstOption = $("#selectName option:first").prop("Selected",'Selected')
var selectattr = $("#selectedName").attr('SelectedIndex,0);
var selectprop = $("#selectedName").prop("SelectedIndex',0);
函数function对象
var s = obj.option[0].Selected = true;
var s = obj[0].selected = true;