这样做的方法是在网格上定义viewConfig:

The way to do it is to define viewConfig on the grid:

Ext.create('Ext.grid.Panel', {
    ...

    viewConfig: {
        getRowClass: function(record, index, rowParams, store) {
            return record.get('someattr') === 'somevalue') ? 'someclass' : '';
        }
    },

    ...
});