<select id='selState' class="selector"></select>
1、动态绑定select下拉框里面的值
  首先清空下拉选择框
  var selectObj = document.getElementById("selState");
  selectObj.options.length = 0;
  然后把后台传过来的值循环绑定上去
                    for (var i = 0; i < json.statelist.length; i++)       {
                     selectObj.options[selectObj.length] = new Option(json.statelist[i].statename, json.statelist[i].statename);
                      } 2、动态绑定值设置text为XX的项选中 
        $("#selState").find("option[value='XX']").attr("selected", true); 
3、获取当前选中项的value   
  $("#selState").val();   
4、获取当前选中项的text  
   $("#selState").find("option:selected").text();