要使用Konva检测拖放事件，可以使用on（）方法将dragstart，dragmove或``dragend事件绑定到节点。 on（）方法需要事件类型和在事件发生时执行的函数。

Konva Drag Events Demo 点击查看

<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.rawgit.com/konvajs/konva/1.4.0/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Drag Events Demo</title>
<style>
    body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #F0F0F0;
    }
</style>
</head>
<body>
<div id="container"></div>
<script>
function writeMessage(message) {
    text.setText(message);
    layer.draw();
}
var width = window.innerWidth;
var height = window.innerHeight;
var stage = new Konva.Stage({
    container: 'container',
    width: width,
    height: height
});
var layer = new Konva.Layer();
var text = new Konva.Text({
    x: 10,
    y: 10,
    fontFamily: 'Calibri',
    fontSize: 24,
    text: '',
    fill: 'black'
});
var box = new Konva.Rect({
    x: 20,
    y: 100,
    offset: [50, 25],
    width: 100,
    height: 50,
    fill: '#00D2FF',
    stroke: 'black',
    strokeWidth: 4,
    draggable: true
});
// write out drag and drop events
box.on('dragstart', function() {
    writeMessage('dragstart');
});
box.on('dragend', function() {
    writeMessage('dragend');
});
layer.add(text);
layer.add(box);
// add the layer to the stage
stage.add(layer);
</script>
</body>
</html>

拖放-事件

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