ExtJS Grid使用SimpleStore、多选框的方法

///<reference path="./vswd-ext_2.0.2.js" />
ext.onready(function(){
var data = [
[1,"wilson.fu",10],
[2,"wilson.fu2",20],
[3,"wilson.fu3",30]
];

var sqldata = new array() ;
for(var i=0;i<10;i++)
{
sqldata.push([i.tostring(),"wilson.fu" + i.tostring(),10*i]);
}

var sm = new ext.grid.checkboxselectionmodel({handlemousedown:ext.emptyfn});
var cm = new ext.grid.columnmodel([
sm,
{header:"编号",dataindex:"id",sortable:true},
{header:"姓名",dataindex:"name"},
{header:"排序值",dataindex:"ordernum",sortable:true}
]);

var store = new ext.data.simplestore({
fields:[
{name:"id"},
{name:"name"},
{name:"ordernum"}
]
});

store.loaddata(sqldata);

var gd = new ext.grid.gridpanel({
renderto:"grid",
cm:cm,
sm:sm,
store:store,
loadmask:true
});

ext.get("btn").on("click",function(){
var selections = gd.getselectionmodel().getselections();
debugger
//得到选择的行的值
});

});