jquery gets the value of option and operates on option_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() ; //Delete the Option with the largest index value
$("#select_id option[index='0']").remove(); //Delete the Option with the index value 0
$("#select_id option [value='3']").remove(); //Delete the Option with value 3
$("#select_id option[text='4']").remove(); //Delete the TEXT value Clear Select for Option 4

$("document").ready(function(){
$("#btn1").click(function(){
$("[name='checkbox']").attr("checked",'true');//Select all
})
$("#btn2").click(function(){
$("[name='checkbox']").removeAttr("checked");//Cancel all selections
})
$("#btn3").click(function(){
$("[name='checkbox']:even").attr("checked",'true');//Select all odd numbers
})
$("#btn4"). click(function(){
$("[name='checkbox']").each(function(){//Inverse selection
if($(this).attr("checked")){
$(this).removeAttr("checked");
}
else{
$(this).attr("checked",'true');
}
} )
})
$("#btn5").click(function(){//Output the selected value
var str="";
$("[name='checkbox' ][checked]").each(function(){
str =$(this).val() "rn";
//alert($(this).val());
})
alert(str);
})
})