以下是百度Echarts官网上关系图的源码，但是这个关系图的node节点和edge都是静态文件里规定好的，我现在想动态实现，点击其中一个节点A然后新产生一个新节点B，并且有A和B之间的edge，就类似于百度的人物关系图谱那种动态生成，怎么实现啊？求教

myChart.showLoading();

$.get('data/asset/data/les-miserables.gexf', function (xml) {

myChart.hideLoading();

var graph = echarts.dataTool.gexf.parse(xml);

var categories = [];

for (var i = 0; i < 9; i++) {

categories[i] = {

name: '类目' + i

};

}

graph.nodes.forEach(function (node) {

node.itemStyle = null;

node.value = node.symbolSize;

node.label = {

normal: {

show: node.symbolSize > 30

}

};

node.category = node.attributes.modularity_class;

});

option = {

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,

label: {

normal: {

position: 'right',

formatter: '{b}'

}

},

lineStyle: {

normal: {

curveness: 0.3

}

}

}

]

};

myChart.setOption(option);

}, 'xml');