取消事件冒泡

我们可以通过设置 Event 的 cancelBubble 属性为 true，来取消事件冒泡

说明：点击图中的圆，只有圆绑定的事件被执行，因为当圆绑定的事件被触发时事件传播被取消了，阻止了事件向上冒泡；

Konva Cancel_Propagation Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/konva@4.0.18/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Cancel Event Bubble Propagation Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
    </style>
  </head>

  <body>
    <div id="container"></div>
    <script>
      var stage = new Konva.Stage({
        container: 'container',
        width: window.innerWidth,
        height: window.innerHeight
      });

      var layer = new Konva.Layer();

      var group = new Konva.Group();

      var circle = new Konva.Circle({
        x: stage.width() / 2,
        y: stage.height() / 2,
        radius: 70,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4
      });

      circle.on('click', function(evt) {
        alert('You clicked the circle!');
        evt.cancelBubble = true;
      });

      group.on('click', function() {
        alert('You clicked on the group!');
      });

      layer.on('click', function() {
        alert('You clicked on the layer!');
      });

      group.add(circle);
      layer.add(group);

      // add the layer to the stage
      stage.add(layer);
    </script>
  </body>
</html>