ExtJs中获得（GridPanel）选中的当前选中行号

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=gbk">
        <title>03.grid</title>
        <link rel="stylesheet" type="text/css" href="../../resources/css/ext-all.css" />
        <script type="text/javascript" src="../../adapter/ext/ext-base.js"></script>
        <script type="text/javascript" src="../../ext-all.js"></script>
        <script type="text/javascript">
Ext.onReady(function(){

    var cm = new Ext.grid.ColumnModel([
        {header:'编号',dataIndex:'id'},
        {header:'名称',dataIndex:'name'},
        {header:'描述',dataIndex:'descn'}
    ]);

    var data = [
        ['1','name1','descn1'],
        ['2','name2','descn2'],
        ['3','name3','descn3'],
        ['4','name4','descn4'],
        ['5','name5','descn5']
    ];

    var store = new Ext.data.Store({
        proxy: new Ext.data.MemoryProxy(data),
        reader: new Ext.data.ArrayReader({}, [
            {name: 'id'},
            {name: 'name'},
            {name: 'descn'}
        ])
    });
    store.load();

var getRowIndex =  new Ext.grid.RowSelectionModel({
listeners: {
        rowselect: function(sm, row, rec) {
		alert(row+1); //计算机计算是从0开始算第一行的，所以加1 补充一下
             //  store.indexOf(rec); //这个是取该选中的rec在store中的位置,应该就是行号
        }
}
});


// 另一种方法 

 /* grid.getSelectionModel().on('rowselect',function(sm,rowIndx,r){

})
*/
 var grid = new Ext.grid.GridPanel({
        autoHeight: true,
        renderTo: 'grid',
        store: store,
        cm: cm,
	sm:getRowIndex 
    });


 });
        </script>
    </head>
    <body>
        <script type="text/javascript" src="../shared/examples.js"></script>
        <div id="grid"></div>
    </body>
</html>

ExtJs中获得（GridPanel）选中的当前选中行号

ExtJs中获得当前选中行号（Grid中多选或者是单选）及Grid的反选（取消选中行）