[sencha] grid column replace

{
   xtype:'gridcolumn',
   itemId: 'id',
   width: 90,
   align: 'center',
   dataIndex: 'id',
   text : '바로가기',
   renderer: function(value, meta, record, rowIndex, colIndex, store, view){
      return Math.round(value/1000) + "Kb";
   }
}

// renderer를 이용하여 replace
// http://docs.sencha.com/extjs/4.2.2/#!/api/Ext.grid.column.Column 참조