var store = new Ext.data.Store({
            proxy: {
                type: 'ajax',
                url: 'data.asp',
                reader: {
                    type: 'json',
                    totalProperty: 'totalProperty',
                    root: 'root',
                    idProperty: 'id'
                }
            },
            pageSize:10,

            fields: [
            { name: 'id' },
            { name: 'name' },
            { name: 'descn' }
        ]
        });
要设置store的pageSize配置,你手动调用load方法指定了limit参数,并不会修改store的的pageSize(默认25)