function init() {

     $("#list1").jqGrid({

         url: "../Listing.ashx",

         datatype: "json",   //返回值类型

         mtype: "post",   //请求类型

         colNames: ["编号", "产品名称", "描述", "价格"],

         colModel: [

             { name: "ProductID", width: 100 },

             { name: "Name", width: 150 },

             { name: "Description", width: 200, align: "right" },

             { name: "Price", width: 80, align: "right" },

         ],

         caption: "My first grid"

     });

 }