JQuery - change, ajax

$( "#test1" ).change(function( e ){ 
  $.ajax({
    type: "post",
    url : "https://",
    data: { mode : "test", sido : $("#test1").val() },
    contentType: 'application/x-www-form-urlencoded; charset=euc-kr',
    dataType:"html",
    success : function( data ) {
      data = JSON.parse( data );
      if( data.code == "002" ) {
        let html = "<option value='0' selected='selected'>test</option>";
        html    += data.content;
        $( "#test" ).empty();
        $( "#test" ).append( html );
        searchFunc();
      } else {
        console.log( data.msg );
      }
    }
  })
});