我有三层画布 - 一层是矩阵,第二层和第三层是图形,如何将它们保存在一个图像中?
<div style="position: relative;">
<canvas id="matix" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 0;"></canvas>
<canvas id="layer1" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 0;"></canvas>
<canvas id="layer2" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 1;"></canvas>
</div>