tree类图型 怎么给文字添加点击事件echarts tree配置项内容和展示

tree类图型 怎么给文字添加点击事件

      option = {

    title: {
        text: 'SOP1'
    },

    series: [{
        type: 'tree',

        data: [{
            "name": "SOP",
            "type": "catalog",
            "children": [{
                "name": "开发部",
                "type": "catalog",
                "children": [{
                    "name": "标准流程",
                    "type": "km",
                    "id": "1",
                    "children": [{
                        "name": "AgglomerativeCluster",
                        "id": 3938
                    }, {
                        "name": "CommunityStructure",
                        "id": 3812
                    }, {
                        "name": "HierarchicalCluster",
                        "id": 6714
                    }, {
                        "name": "MergeEdge",
                        "id": 743
                    }]
                }]
            }]
        }],

        top: '1%',
        left: '7%',
        bottom: '1%',
        right: '20%',

        symbolSize: 20,

        label: {
            position: 'left',
            verticalAlign: 'middle',
            align: 'right',
            fontSize: 15,

            formatter: '{a|{b}}',
            rich: {
                a: {
                    color: 'red',
                    lineHeight: 10
                }
            }
        },

        leaves: {
            label: {
                position: 'right',
                verticalAlign: 'middle',
                align: 'left'
            }
        },

        expandAndCollapse: true,
        animationDuration: 550,
        animationDurationUpdate: 750
    }]
}