qq_42165574的博客

const img = new Image() img.src = url img.onload = function() { //图片onload后才能获得width和height } const mycanvas = document.createElement('canvas') ctx.translate(x, y) //把画原点更改 ctx.rotate(Math.PI / 2) //顺时针旋转90度，默认旋转点为0，0，可以自行更改 ctx.drawImage(img, 0, ..