jquery code to get drop-down box value_jquery

$("#ddlRegType ").attr("value" ,"Normal");
$("#ddlRegType ").val("Normal");
$("#ddlRegType ").get(0).value = value;

var count= $("#ddlRegType option").length;
for(var i=0;i{ if($("#ddlRegType ").get(0).options[i] .text == text)
{
$("#ddlRegType ").get(0).options[i].selected = true;
break;
}
}

$("#select_id option[text='jQuery']").attr("selected", true);

$("#select_id").append("Text"); //Add an option
$("#select_id").prepend("Please select "); //Insert an option in front
$("#select_id option:last").remove(); //Remove the Option with the largest index value
$("#select_id option[index=' 0']").remove(); //Delete the Option with an index value of 0
$("#select_id option[value='3']").remove(); //Delete the Option with a value of 3
$("#select_id option[text='4']").remove(); //Delete Option with TEXT value 4