jquery两级联动插件doubleSelect

$(document).ready(function(){
  var sOption={
    "选项一":{
      "key":"s_1",//选项一的值
      "defaultvalue" : 111,
      "values":{
        "选项1_1":"s_1_1",
        "选项1_2":"s_1_2",
                    "选项1_3":"s_1_3"
      }
    },
    "选项二":{
      "key":"s_2",
      "defaultvalue" : 222,
      "values":{
        "选项2_1":"s_2_1",
        "选项2_2":"s_2_2",
        "选项2_3":"s_2_3",
        "选项2_4":"s_2_4"
      }
    }
  };
  //s1 s2是两个select的id
  $("#s1").doubleSelect('s2',sOption);  
});