要使用Konva的层，我们可以使用以下分层方法之一： moveToTop（），moveToBottom（），moveUp（），moveDown（）或zIndex（）。
您还可以区分层组和层。

说明：拖放移动它们，然后使用按钮重新排序。

Konva Shape Layering 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 Shape Layering Demo</title>
<style>
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #F0F0F0;
}
#buttons {
    position: absolute;
    left: 10px;
    top: 0px;
}
button {
    margin-top: 10px;
    display: block;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="buttons">
  <button id="toTop">
      Move yellow box to top
  </button>
  <button id="toBottom">
      Move yellow box to bottom
  </button>
  <button id="up">
      Move yellow box up
  </button>
  <button id="down">
      Move yellow box down
  </button>
  <button id="zIndex">
      Set yellow box zIndex to 3
  </button>
</div>
<script>
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 offsetX = 0;
var offsetY = 0;
var colors = ['red', 'orange', 'yellow', 'green', 'blue', 'purple'];
var yellowBox = null;
for(var n = 0; n < 6; n++) {
    // anonymous function to induce scope
    (function() {
        var i = n;
        var box = new Konva.Rect({
            x: i * 30 + 210,
            y: i * 18 + 40,
            width: 100,
            height: 50,
            fill: colors[i],
            stroke: 'black',
            strokeWidth: 4,
            draggable: true,
            name: colors[i]
        });
        box.on('mouseover', function() {
            document.body.style.cursor = 'pointer';
        });
        box.on('mouseout', function() {
            document.body.style.cursor = 'default';
        });
        if(colors[i] === 'yellow') {
            yellowBox = box;
        }
        layer.add(box);
    })();
}
stage.add(layer);
// add button event bindings
document.getElementById('toTop').addEventListener('click', function() {
    yellowBox.moveToTop();
    layer.draw();
}, false);
document.getElementById('toBottom').addEventListener('click', function() {
    yellowBox.moveToBottom();
    layer.draw();
}, false);
document.getElementById('up').addEventListener('click', function() {
    yellowBox.moveUp();
    layer.draw();
}, false);
document.getElementById('down').addEventListener('click', function() {
    yellowBox.moveDown();
    layer.draw();
}, false);
document.getElementById('zIndex').addEventListener('click', function() {
    yellowBox.setZIndex(3);
    layer.draw();
}, false);
</script>
</body>
</html>

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