Google Charts，隐藏列的显示，但保留基础数据以供使用

In the following JSON:

在以下JSON中：

        var data = new google.visualization.DataTable(
            {
            cols: [{id: 'Option1', label: 'Manufacturer', type: 'string'},
                   {id: 'Option2', label: 'Region', type: 'string'},
                   {id: 'Option3', label: 'Option3', type: 'number'},
                   {id: 'Option4', label: 'Option4', type: 'number'},
                   {id: 'Option5', label: 'Option5', type: 'number'},
                   {id: 'Option6', label: 'Option6', type: 'number'},
                   {id: 'Option7', label: 'Option7', type: 'number'},
                   {id: 'Option8', label: 'Option8', type: 'number'}],


            rows: [{c:[{v: 'Ford'}, {v: 'South East'}, {v: 2}, {v: 3}, {v: 4}, {v: 5}, {v: 6}, {v: 7}]},
                    {c:[{v: 'Ford'}, {v: 'South East'}, {v: 2}, {v: 3}, {v: 4}, {v: 5}, {v: 6}, {v: 7}]},
                    {c:[{v: 'Ford'}, {v: 'South East'}, {v: 2}, {v: 3}, {v: 4}, {v: 5}, {v: 6}, {v: 7}]},
                    {c:[{v: 'BMW'}, {v: 'South East'}, {v: 2}, {v: 3}, {v: 4}, {v: 5}, {v: 6}, {v: 7}]},
                    {c:[{v: 'BMW'}, {v: 'North'}, {v: 2}, {v: 3}, {v: 4}, {v: 5}, {v: 6}, {v: 7}]},
                    {c:[{v: 'BMW'}, {v: 'North'}, {v: 2}, {v: 3}, {v: 4}, {v: 5}, {v: 6}, {v: 7}]},
                    {c:[{v: 'Citroen'}, {v: 'North'}, {v: 2}, {v: 3}, {v: 4}, {v: 5}, {v: 6}, {v: 7}]},
                    {c:[{v: 'Citroen'}, {v: 'South East'}, {v: 2}, {v: 3}, {v: 4}, {v: 5}, {v: 6}, {v: 7}]}
                    ]
            },
            0.6
        )
        va