EXTJS store 添加baseParams

//gridP gridpanel id
Ext.apply(Ext.getCmp("gridP").store.baseParams, { 参数1: 111, 参数2:222 });

grid = new Ext.grid.GridPanel({
frame: true,
id: 'gridP',
title: 'Order List',
stripeRows: true, //斑马线
store: store,
applyTo: 'view', //指定显示数据的div
trackMouseOver: true,
height: 700,
width: window.screen.width - 17, //屏幕分辨率的宽   textfield
tbar: [
{
xtype: 'label',
text: '选择日期'
},
{
xtype: 'datefield',
id: 'txtBegin'
},
{
xtype: 'label',
text: '---'
},
{
xtype: 'datefield',
id: 'txtEnd'
},
{
xtype: 'button',
text: 'Search',
handler: function () {
//提交数据
var begin = Ext.fly('txtBegin').dom.value;
var end = Ext.fly('txtEnd').dom.value;
document.getElementById('hdbegin').value = begin;
document.getElementById('hdend').value = end;
if (begin == "") return;
if (end == "") return;
store.proxy.conn.url = 'ExtData.aspx?type=3&p=' + Math.random();

//往store添加baseParams
Ext.apply(Ext.getCmp("gridP").store.baseParams, { begin: begin, end: end });

store.load({
params: {
start: 0,
limit: 20,
begin: begin,
end: end
}
})

}
}
],
viewConfig: {
forceFit: true, //让grid的列自动填满grid的整个宽度，不用一列一列的设定宽度。
emptyText: 'No Data'
},
loadMask: { msg: 'loading……' },

columns: [
new Ext.grid.RowNumberer(), //行号
{header: '<font size=2>OrderID</font>', dataIndex: 'OrderID', sortable: true, align: "center" },
{ header: '<font size=2>Sales Type</font>', dataIndex: 'State', sortable: true, align: "center", hidden: true,
renderer: function (value) {
if (value == "0") { return "pending"; } else if (value == "1") { return "processed"; } else { return "xxx"; }
}
},
{ header: '<font size=2>SO</font>', dataIndex: 'SO', sortable: true, align: "center" },
{ header: '<font size=2>PSI</font>', dataIndex: 'PSI', sortable: true, align: "center" },
{ header: '<font size=2>Company</font>', dataIndex: 'Company', sortable: true, align: "center" },
{ header: '<font size=2>Date</font>', dataIndex: 'Odate', sortable: true, align: "center" },
{ header: '<font size=2>Email</font>', dataIndex: 'Email', sortable: true, align: "center" },
{ header: '<font size=2>Payment</font>', dataIndex: 'Payment_Terms_Code', sortable: true, align: "center" },
{ header: '<font size=2>Preorderid</font>', dataIndex: 'Preorderid', sortable: true, align: "center" },
{ header: '<font size=2>Items</font>', dataIndex: 'Items', sortable: true, align: "center" }
],
bbar: new Ext.PagingToolbar({//分页
pageSize: 20,
store: store,
displayInfo: true, //非要为true，不然不会显示下面的分页按钮
emptyMsg: "NO DATA"
})
})