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js 读取图片私有扩展信息，处理二进制数据

使用canvas拼图将多张图片绘制在canvas上图片尺寸: 1920 * 1080 拼4张图 canvas: width = 1920 * 4 height = 1080 <canvas id="myCanvas" width="7680" height="1080"></canvas> let canv = document.getElementById('myCanvas'); let ctx = canv.getContext('2d'); let

canvas截图将图片用canvas绘制出来 <canvas id="myCanvas" width="400" height="400"></canvas> let canv = document.getElementById('myCanvas'); let ctx = canv.getContext('2d'); let image = new Image(); image.onload = function() { ctx.drawImage(image,