力引导布局事件触发问题echarts graph配置项内容和展示

给mychart注册了‘click’事件，但是拖拽结束之后click事件被触发。请问如何解决。

       var categories = [];
 for (var i = 0; i < 9; i++) {
     categories[i] = {
         name: '类目' + i
     };
 }
 var graph = {
     nodes: null,
     links: null
 };
 graph.nodes = [{
     name: '1',
     draggable: true,
     value: 10,
     attributes: {
         modularity_class: 0
     },
     category: 0
 }, {
     name: '2',
     value: 20,
     draggable: true,
     symbolSize: 10,
     tooltip: {
         formatter: '{b}'
     },
     attributes: {
         modularity_class: 0
     },
     category: 0
 }, {
     name: '3',
     attributes: {
         modularity_class: 2
     },
     itemStyle: {
         normal: {
             color: 'yellowgreen',
         }
     },
     category: 0,
     value: 10
 }, {
     name: '4',
     attributes: {
         modularity_class: 0
     },
     category: 2,
     value: 10
 }, {
     name: '5',
     attributes: {
         modularity_class: 0
     },
     category: 2,
     value: 10
 }];
 graph.links = [{
     source: '1',
     target: '2'
 }, {
     source: '3',
     target: '2'
 }, {
     source: '4',
     target: '3'
 }, {
     source: '5',
     target: '3'
 }];
 option = {
     cursor: 'pointer',
     title: {
         text: '000',
         subtext: '0.0',
         left: 'center'
     },
     series: {
         name: 'Les Miserables',
         type: 'graph',
         layout: 'force',
         data: graph.nodes,
         links: graph.links,
         categories: categories,
         roam: true,
         force: {
             repulsion: 100,
             gravity: 0.4,
             edgeLength: 20,
         },
         symbolSize: 5,
         edgeSymbol: ['', 'arrow'], 
         edgeSymbolSize: 3, 
         lineStyle: {
             normal: {
                 color: 'target',
                 width: 1,
                 type: 'solid'
             }
         },
     }
 };
 myChart.on('click', function (params) {
            alert(params);
            myChart.showLoading()
            setTimeout(function () {
                    myChart.setOption(option);
                myChart.hideLoading()
            }, 1000)
        });