Extjs4.1中图片数据源

var jdPicStore = Ext.create('Ext.data.Store',{
             fields: ['icon','evalValue'],
                data: [
                    {
                        icon:'img/close.gif',
                        evalValue:null
                    },
                    {
                       icon:'img/smallGreen.png',
                       evalValue:'green'
                   },
                   {
                       icon:'img/smallYellow.png',
                       evalValue:'yellow'
                   },
                   {
                       icon:'img/smallRed.png',
                       evalValue:'red'
                   }
                ]
        });

var picStore4Erisiko = Ext.create('Ext.data.Store',{
                fields: ['renderer','erisiko','icon'],
                data: [{
                      renderer:"<img src='img/smallYellow.png' width='17' height='13'/>",
                      icon:'img/smallYellow.png',
                      erisiko:'Yellow'
                },{
                      renderer:"<img src='img/smallGreen.png' width='17' height='13'/>",
                      icon:'img/smallGreen.png',
                      erisiko:'Green'
                },{
                      renderer:"<img src='img/smallRed.png' width='17' height='13'/>",
                      icon:'img/smallRed.png',
                      erisiko:'Red'
                }]
            });