如何将cssclass添加到由javascript创建的动态文本框中

$("#btnAdd").bind("click", function () {
                 var div = $("<div />");
                 div.html(GetDynamicTextBox("", ""));
                 $('ContactName').addClass('form-control has-ns');
                 
                 $("#TextBoxContainer").append(div);
                 return false;
             });
             $("body").on("click", ".remove", function () {
                 $(this).closest("div").remove();

             });
         });
         function GetDynamicTextBox(valuename, valueemail) {


             return '<input name = "ContactName" type="text" value = "' + valuename + '" /> ' + '<input name = "ContactEmail" type="text" value = "' + valueemail + '" /> ' +
           '<input type="button" value="Remove" class="remove" />'

我的尝试：



$（'ContactName'）。addClass（'form-control has-ns'）;

到这行我要添加css类但是它的没有显示在我的textbox.please帮助！

What I have tried:

$('ContactName').addClass('form-control has-ns');
to this line i want to add css class but its not showing on my textbox.please help!