求助；解决乱码问题

success:function(data,textStatus)
{ if(data.returnstr=="0")
   {
    $.ajax({
      type:"POST",
      url:"DiscussQueryAction.action",
      dataType:"JSON",
      async:false,
      data:{},
      timeout:2000,
      success:function(data,textStatus)
     {  
  var  result="";
      var datamgs=data.returndata;
     $.each(datamgs,function(key,values){
    result+="<div style='width:450px; margin:5px; border:solid 1px #F69'>";
result+="<div style='background:url(bg.gif) repeat-x; height:25px; line-height:25px;'>";
result+="<span style='padding-left:15px;'>发表于：</span>";
result+="<span>"+values.time+"</span></div>";
result+="<div style='height:200px;'>"+values.content+"</div>";
result+="<div style='background:url(bg.gif) repeat-x; height:23px'><span style='line-height:25px'>管理</span></div>";
        result+="</div>"
});
$("#smgs").html(result);标红部分出现乱码；求解； 已设置response.setContentType("UTF-8");
乱码