easyui 加载json数据

1.在js中json格式数据加载到datagrid中，需要注意的是数据要先加载出来$(function(){    $('#dg').datagrid('loadData',{"total":28,"rows":[            {"productid":"FI-SW-01","productname":"Koi","unitcost":10.00,"status":"P","listprice":36.50,"attr1":"Large","itemid":"EST-1"},            {"productid":"K9-DL-01","productname":"Dalmation","unitcost":12.00,"status":"P","listprice":18.50,"attr1":"Spotted Adult Female","itemid":"EST-10"},            {"productid":"RP-SN-01","productname":"Rattlesnake","unitcost":12.00,"status":"P","listprice":38.50,"attr1":"Venomless","itemid":"EST-11"},            {"productid":"RP-SN-01","productname":"Rattlesnake","unitcost":12.00,"status":"P","listprice":26.50,"attr1":"Rattleless","itemid":"EST-12"},            {"selected":true,"productid":"RP-LI-02","productname":"Iguana","unitcost":12.00,"status":"P","listprice":35.50,"attr1":"Green Adult","itemid":"EST-13"},            {"productid":"FL-DSH-01","productname":"Manx","unitcost":12.00,"status":"P","listprice":158.50,"attr1":"Tailless","itemid":"EST-14"},            {"productid":"FL-DSH-01","productname":"Manx","unitcost":12.00,"status":"P","listprice":83.50,"attr1":"With tail","itemid":"EST-15"},            {"productid":"FL-DLH-02","productname":"Persian","unitcost":12.00,"status":"P","listprice":23.50,"attr1":"Adult Female","itemid":"EST-16"},            {"productid":"FL-DLH-02","productname":"Persian","unitcost":12.00,"status":"P","listprice":89.50,"attr1":"Adult Male","itemid":"EST-17"},            {"productid":"AV-CB-01","productname":"Amazon Parrot","unitcost":92.00,"status":"P","listprice":63.50,"attr1":"Adult Male","itemid":"EST-18"}    ]});})2.在datagrid中展示json格式数据<table id="dg" class="easyui-datagrid" title="fluid datagrid" style="width:700px;height:250px;"        data-options="            singleSelect:true,            collapsible : true,            ">        <thead>            <tr>                <th data-options="field:'itemid',resizable:true" width="15%">Item ID(15%)</th>                <th data-options="field:'productid',resizable:true" width="15%">Product(15%)</th>                <th data-options="field:'listprice',align:'right',resizable:true" width="15%">List Price(15%)</th>                <th data-options="field:'unitcost',align:'right',resizable:true" width="15%">Unit Cost(15%)</th>                <th data-options="field:'attr1',resizable:true" width="25%">Attribute(25%)</th>                <th data-options="field:'status',align:'center',resizable:true" width="15%">Status(15%)</th>            </tr>        </thead>    </table>第二种方式：直接使用get、方式访问站点中的json文件，json数据的地址是'项目名/analysis/myTest/datagrid.json'<table id="dg" class="easyui-datagrid" title="fluid datagrid" style="width:700px;height:250px;"        data-options="            singleSelect:true,            collapsible : true,            url : '/analysis/myTest/datagrid.json',            method : 'get'            ">        <thead>            <tr>                <th data-options="field:'itemid',resizable:true" width="15%">Item ID(15%)</th>                <th data-options="field:'productid',resizable:true" width="15%">Product(15%)</th>                <th data-options="field:'listprice',align:'right',resizable:true" width="15%">List Price(15%)</th>                <th data-options="field:'unitcost',align:'right',resizable:true" width="15%">Unit Cost(15%)</th>                <th data-options="field:'attr1',resizable:true" width="25%">Attribute(25%)</th>                <th data-options="field:'status',align:'center',resizable:true" width="15%">Status(15%)</th>            </tr>        </thead>    </table>