问题：单击grid的某一行，如何改变该行的背景颜色？

我定义了一个grid，并添加了rowclick事件的监听，可是不知道该如何修改这一行的背景色。请教高手一下。代码如下：
grid.addListener('rowclick',function(grid,rowIndex,event){
// 这里的代码不知道该如何写了，才能改变这行的背景色。
// 当然，当我点击别的行时，这一行的背景颜色要改变到每点击之前的默认颜色
});

我帮你实现了,给我分吧

[code="js"]
Ext.onReady(function() {
var myData = [
['3m Co',71.72,0.02,0.03,'9/1 12:00am'],
['Alcoa Inc',29.01,0.42,1.47,'9/1 12:00am'],
['Altria Group Inc',83.81,0.28,0.34,'9/1 12:00am'],
['American Express Company',52.55,0.01,0.02,'9/1 12:00am'],
['American International Group, Inc.',64.13,0.31,0.49,'9/1 12:00am']
];

function change(val){
    if(val > 0){
        return '<span style="color:green;">' + val + '</span>';
    }else if(val < 0){
        return '<span style="color:red;">' + val + '</span>';
    }
    return val;
}

function pctChange(val){
    if(val > 0){
        return '<span style="color:green;">' + val + '%</span>';
    }else if(val < 0){
        return '<span style="color:red;">' + val + '%</span>';
    }
    return val;
}

var store = new Ext.data.SimpleStore({
    fields: [
       {name: 'company'},
       {name: 'price', type: 'float'},
       {name: 'change', type: 'float'},
       {name: 'pctChange', type: 'float'},
       {name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia'}
    ]
});
store.loadData(myData);
var grid = new Ext.grid.GridPanel({
    store: store,
    columns: [
        {id:'company',header: "Company", width: 160, sortable: true, dataIndex: 'company'},
        {header: "Price", width: 75, sortable: true, renderer: 'usMoney', dataIndex: 'price'},
        {header: "Change", width: 75, sortable: true, renderer: change, dataIndex: 'change'},
        {header: "% Change", width: 75, sortable: true, renderer: pctChange, dataIndex: 'pctChange'},
        {header: "Last Updated", width: 85, sortable: true, renderer: Ext.util.Format.dateRenderer('m/d/Y'), dataIndex: 'lastChange'}
    ],
    stripeRows: true,
    autoExpandColumn: 'company',
    enableHdMenu : true,
    height:350,
    width:600,
    title:'Array Grid'
});
grid.render(Ext.getBody());
grid.on('rowclick',function(grid,rowIndex,event){
    var node = event.target;
    while(node.tagName != 'TR'){
        node = node.parentNode;
        if(node.tagName == 'TR'){
            break;
        }
    }
    var elDiv = node.parentNode.parentNode.parentNode.parentNode; 
    for(var i = 0; i<elDiv.childNodes.length;i++){
        elDiv.childNodes[i].childNodes[0].childNodes[0].childNodes[0].style.cssText="background-color:";
    }
    node.style.cssText="background-color:red";
});

})

[/code]