OpenLayers的canvas图层叠加_openlayers 叠加cavans

OpenLayers中在overlayer层使用canvas图层叠加

介绍

我在此做了在canvas layer1层做出滑动效果
layer2层插入图片，实现在layer2层上方做出滑动效果，可以结合数据库做出滑动快慢，和上下滑动的效果

<div id="map" style="width: 100%;position: relative"></div>
<canvas id="layer1" style="position: absolute"></canvas>
<canvas id="layer2" style="position: absolute"></canvas>



<script>
    var canvasLayer1 = new ol.Overlay({
        element: document.getElementById('layer1'),
        scale:0.15
    });
    canvasLayer1.setPosition([115.9507, 31.58]);
    map.addOverlay(canvasLayer1);

    var canvasLayer2 = new ol.Overlay({
        element: document.getElementById('layer2'),
        scale:0.15
    });
    canvasLayer2.setPosition([115.9507, 31.58]);
    map.addOverlay(canvasLayer2);

var layer1=document.getElementById("layer1");
    var wh=
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