在柱形图中添加不同的彩色条

Question

我正在尝试添加不同的颜色条，但是当我在选项中使用colors时，似乎是所有条形图的第一个选项为红色。有帮助吗？我正在使用datatable

请找到以下代码：

    graphData = data;  
    var arr = Object.keys(graphData).map(function (k) { return graphData[k] });
    var tdata = new google.visualization.DataTable();
    tdata.addColumn('string', 'Testing');
    tdata.addColumn('number', 'Amount');

    var col1 = Object.keys(graphData[0])[0];
    col1 = col1.replace("_", " ");
    var col2 = Object.keys(graphData[0])[1];
    col2 = col2.replace("_", " ");
    var col3 = Object.keys(graphData[0])[2];
    col3 = col3.replace("_", " ");

    if (col3 == "TM Automation") {
        col3 = col3.replace("Auto", "T")
    }

    tdata.addRow([col1, arr[0].Manual])
    tdata.addRow([col2, arr[0].OCB_Auto]);
    tdata.addRow([col3, arr[0].Amount]);

    options = {
        fontSize: 12,
        height: 430,
        width: 380,
        chartArea: { left: "25%", top: "20%", right: "5%", bottom: "10%" },
        title: 'Project',
        pieSliceText: 'value',
        colors: ['red', 'green', 'blue'],
        'is3D': true
    };
    var chart = new google.visualization.ColumnChart(document.getElementById('drilldown_div'));
    chart.draw(tdata, options);
    return false;