能否改变被突出的边的透明度？echarts graph配置项内容和展示

focusNodeAdjacency: true, 1.在鼠标移到节点上的时候突出显示节点以及节点的边和邻接节点。 怎么改变被突出的边的透明度 2.鼠标悬停在边上时，能否突出边两端的节点

      var uploadedDataURL = "/asset/get/s/data-1499235623264-Bk1VBW5Nb.gexf";

myChart.showLoading();
$.get(uploadedDataURL, function (xml) {
    myChart.hideLoading();

    var graph = echarts.dataTool.gexf.parse(xml);
    var categories = [];
    for (var i = 0; i < 20; i++) {
        categories[i] = {
            name: '类目' + i
        };
    }
    graph.nodes.forEach(function (node) {
       var itemClass = node.attributes.modularity_class;
        node.itemStyle = null;
        node.value = node.symbolSize;
        node.symbolSize /= 1.5;
        function addcolor(node) { //根据需要设置颜色列表
            var colorList = ['red', 'blue', 'black', 'yellow', 'pink', '#FE8463'];
            return colorList[itemClass];
        };
        node.itemStyle={
            normal: {
                //color: addcolor(node),
                //curveness: 0.3
            }
        },
        node.label = {
            normal: {
                show: node.symbolSize > 30
            }
        };
        node.category = node.attributes.modularity_class;
    });
    option = {
        //color:['red', 'green','yellow','blueviolet','black'],
        color: ['red', '#B5C334', '#FCCE10', '#E87C25', '#27727B', '#FE8463', '#9BCA63', '#FAD860', '#F3A43B', '#60C0DD', '#D7504B', '#C6E579', '#F4E001', '#F0805A', '#26C0C0'],
        //color:['red','#2f4554', '#61a0a8', '#d48265', '#91c7ae','#749f83',  '#ca8622', '#bda29a','#6e7074', '#546570', '#c4ccd3'],
        title: {
            text: 'Les Miserables',
            subtext: 'Default layout',
            top: 'bottom',
            left: 'right'
        },
        tooltip: {},
        legend: [{
            // selectedMode: 'single',
            data: categories.map(function (a) {
                return a.name;
            })
        }],
        animationDuration: 1500,
        animationEasingUpdate: 'quinticInOut',
        
        series : [
            {
                name: 'Les Miserables',
                type: 'graph',
                layout: 'none',
                data: graph.nodes,
                links: graph.links,
                categories: categories,
                roam: true,
                focusNodeAdjacency: true,
                label: {
                    normal: {
                        position: 'right',
                        formatter: '{b}'
                    }
                },
                lineStyle: {
                    normal: {
                        color: 'target',
                        curveness: 0.3,
                        opacity: 0.2
                    },
                    emphasis: {
                        color:'blue',
                        opacity: 0.9,
                        width: 2,
                        //color: 'red'
                    }
                }
            }
        ]
    };

    myChart.setOption(option);
}, 'xml');

 myChart.on('mouseover', function (params) {
    if(params.dataType == 'node'){
        console.log(params);
        var selected = params.name;
        console.log(selected);
    }
    // myCharts.setOption({
    //     options : [
    //         {                // option1
    //             series : [{
    //                 lineStyle: {
    //                     emphasis: {
    //                         //color:'blue',
    //                         width: 2,
    //                         //color: 'red'
    //                     }
    //                 }
    //             }]
    //         },
    //     ]
    // });
});