如何擦除自定义项目canvas vis.js

我试图用vis.js创建dinamic网络，我需要删除创建的自定义项，但当我使用"clearRect（）"删除我的网络时，这是我的点击函数代码

network.on("click", function (params) {
    network.on("afterDrawing", function (ctx) {
        ctx.clearRect(0, 0, 1200, 1600);
        var nodeId = params.nodes[0];
        if(nodeId != undefined)
        {
            var nodePosition = network.getPositions([nodeId]);
            ctx.strokeStyle = '#294475';
            ctx.lineWidth = 4;
            ctx.fillStyle = '#A6D5F7';
            ctx.circle(nodePosition[nodeId].x, nodePosition[nodeId].y, 20);
            ctx.fill();
            ctx.stroke();
        }
    });
});

仅仅更改画布是不够的。您必须更改基础数据结构。

请查看官方的dynamicData示例。

这里有一个简单的例子，点击删除节点：

var nodes = new vis.DataSet([
  {id: 1, label: 'Node 1'},
  {id: 2, label: 'Node 2'},
  {id: 3, label: 'Node 3'},
  {id: 4, label: 'Node 4'},
  {id: 5, label: 'Node 5'}
]);
var edges = new vis.DataSet([
  {from: 1, to: 3},
  {from: 1, to: 2},
  {from: 2, to: 4},
  {from: 2, to: 5}
]);
// create a network
var container = document.getElementById('mynetwork');
var network = new vis.Network(container, { 
  nodes: nodes,
  edges: edges
}, {});
network.on("click", function (params) {
  params.nodes.forEach(function(nodeId) {
    nodes.remove({id: nodeId});  
  });    
});

#mynetwork {
  width: 100%;
  height: 100%;
  border: 1px solid black;
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <script src="//cdnjs.cloudflare.com/ajax/libs/vis/4.16.1/vis.min.js"></script>
  <link href="//cdnjs.cloudflare.com/ajax/libs/vis/4.16.1/vis.min.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<div id="mynetwork"></div>
</body>
</html>

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