JSON:

//得到远程json对象
//其中jsoncallback.js内容为
//{ 'results': 2, 'rows': [
// { 'id': 1, 'name': 'Bill', occupation: 'Gardener' },
// { 'id': 2, 'name': 'Ben', occupation: 'Horticulturalist' } ]
//}
//定义proxy
var proxy=new Ext.data.HttpProxy({url:'jsoncallback.js'});
//定义reader
var reader=new Ext.data.JsonReader(
{
totalProperty: "results",//totalRecords属性由json.results得到
root: "rows", //构造元数据的数组由json.rows得到
id: "id" //id由json.id得到
},[
{name: 'name', mapping: 'name'},
{name: 'occupation'} //如果name与mapping同名,可以省略mapping
]
)
//构建Store
var store=new Ext.data.Store({
proxy:proxy,
reader:reader
});
//载入
store.load();

XML:

<?xml version="1.0" encoding="utf-8" ?>
<dataset>
<results>2</results>
<row>
<id>1</id>
<name>Bill</name>
<occupation>Gardener</occupation>
</row>
<row>
<id>2</id>
<name>Ben</name>
<occupation>Horticulturalist</occupation>
</row>
</dataset>
/////////////////////////////////////
var proxy=new Ext.data.HttpProxy(...{url:'datasource.xml'});

var reader = new Ext.data.XmlReader({
totalRecords: "results",
record: "row",
id: "id"
}, [
{name: 'name', mapping: 'name'},
{name: 'occupation'}
]);
var store=new Ext.data.Store({
proxy:proxy,
reader:reader
});
store.load();