jquery解析json数据

 jquery解析json数据:
 var data="
 {
 root:
 [
 {name:'1',value:'0'},
 {name:'6101',value:'北京市'},
 {name:'6102',value:'天津市'},
 {name:'6103',value:'上海市'},
 {name:'6104',value:'重庆市'},
 {name:'6105',value:'渭南市'},
 {name:'6106',value:'延安市'},
 {name:'6107',value:'汉中市'},
 {name:'6108',value:'榆林市'},
 {name:'6109',value:'安康市'},
 {name:'6110',value:'商洛市'}
 ]
 }";
 //data为字符串类型 则要将字符串类型转换成json数据类型
 var jsondatas=eval("("+data+")");
 $.each(jsondatas.root,function(i,n){
 alert("name"+n.name+"value"+n.value);
 }
 )
 //以下为数组类型字符串 转换成json 字符串 解析
     //数组形式的json字符串
     var jsondata="[{name:'1',value:'0'},   {name:'6101',value:'西安市'},   {name:'6102',value:'铜川市'},   {name:'6103',value:'宝鸡市'},   {name:'6104',value:'咸阳市'},   {name:'6105',value:'渭南市'},   {name:'6106',value:'延安市'},   {name:'6107',value:'汉中市'},   {name:'6108',value:'榆林市'},   {name:'6109',value:'安康市'},   {name:'6110',value:'商洛市'}]";
 var json=eval(jsondata);
 $.each(json,function(i,n){
 alert(json[i].name);
 alert(json[i].value);//根据索引取值
 });
 //json数据字符 不需要转换
 var json={"Products":[
 {"orderid":"11077","customerid":"RATTC"},
 {"orderid":"11078","customerid":"RATT"}
 ],
 "Img":[{"id":"12345","url"
 :"image/1.jpg"}
 ]};
 $.each(json.Products,function(i,n){
    alert(n.orderid);
 })

 

 一般处理文件(Handler.ashx)
   if (context.Request.QueryString["method"] != null)
         {
             string method = context.Request.QueryString["method"].ToString();
             if (method == "getlist")
             {
                 string str = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
                 SqlConnection conn = new SqlConnection(str);
                 conn.Open();
                 SqlCommand cmd = new SqlCommand();
                 cmd.Connection = conn;
                 cmd.CommandText = "select ProID,ProName,url from Project where Adress = '哈尔滨'";
                 DataSet ds = new DataSet();
                 SqlDataAdapter da = new SqlDataAdapter(cmd);
                 da.Fill(ds);
                 string sb = CreateJsonParameters(ds.Tables[0]);


                 context.Response.ClearContent();
                 context.Response.Write(sb.ToString());
                 context.Response.End();
             }
         }
     }

     ///
     /// 构建JSON字符串
    ///
      ///
      ///
    public  string CreateJsonParameters(DataTable dt)
     {
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        if (dt != null && dt.Rows.Count > 0)
          {
            sb.Append("[");
            for (int i = 0; i < dt.Rows.Count; i++)
          {
                sb.Append("{");
              for (int j = 0; j < dt.Columns.Count; j++)
               {
                   //如果值不是最后一个则添加逗号分隔
                    if (j < dt.Columns.Count - 1)
                    {
                       sb.Append("/"" + dt.Columns[j].ColumnName.ToString() + "/":" + "/"" + dt.Rows[i][j].ToString() + "/",");
                   }
                         //如果值为最后个字符则不添加逗号
                     else if (j == dt.Columns.Count - 1)
                    {
                        sb.Append("/"" + dt.Columns[j].ColumnName.ToString() + "/":" + "/"" + dt.Rows[i][j].ToString() + "/"");
                    }
                }
                 //如果为最后一个值的话 则不添加逗号
                if (i == dt.Rows.Count - 1)
                {
                     sb.Append("}");
                }
               else
                {
                    sb.Append("},");
               }

           }
            sb.Append("]");
             return sb.ToString();

         }
      else { return null; }
   }

 $.ajax
            (
            {
                type: "POST",
                url: "Handler.ashx?method=getlist",
                async: false,//true表示异步 false表示同步
                contentType: "application/json",
                dataType: 'json',
                success: function(result) {
                 var temp=eval(result);
                 //通过javascript来解析返回数组字符串
                 for (var i = 0; i < temp.length; i++)
                {
                    o.innerHTML += "项目名称:" + result[i].ProName + "网址: + result[i].url + " mce_href=" + result[i].url + "  target='_blank'>" + result[i].url + "";
                    datas += "项目名称:" + result[i].ProName + "网址: + result[i].url + " mce_href=" + result[i].url + "  target='_blank'>" + result[i].url + "";

                }
                    TINY.box.show(datas, 0, 0, 0, 1);



                }

            });

本文转自:http://blog.csdn.net/happy664618843/article/details/5954422