html5 - canvas里的dramImage画好的图是图片精灵合起来的，想拿到其中一部分，怎么做高效？

Question

canvas里的dramImage画好的图是图片精灵合起来的，想拿到其中一部分，怎么做高效？
求助JS大神

Answer 1

drawimage provides parameter cutting pictures, which can display pictures at specific locations and sizes.
If you want to be efficient, you can draw the image into a new canvas, and then drawimage the canvas, the performance will be significantly improved