echart 关系图 怎么让label文字旋转方向或者挪动位置/改变某一层的颜色

Question

series : [ {

                type : 'force',
                name : "Force tree",
                itemStyle : {
                    normal : {
                        label: {
                            show: true,
                            textStyle: {
                                color: "#333",
                                rotate:true,
                            },
                        },
                        nodeStyle : {
                            brushType : 'both',
                            borderColor : 'rgba(255,215,0,0.4)',
                            borderWidth : 1
                        },
                        linkStyle: {
                            type: "curve",
                            color: "#10a0ea",
                            width: 0.5
                        }
                    }
                },
                gravity: 1,//间距
                categories: [{name: '公司'}, {name: '职位'}, {name: '成员'}],
                nodes：[{
                        id: 7,category: 1,name: '7',label: '学院3',symbolSize: 20,flag: true,
                        normal: {
                            label: {
                                rotate: true
                            }
                        },
                        nodeStyle: {
                            color: "red"
                        },

                    }, ]