html2canvas截图object-fit不生效问题处理

一、解决方案一：

图片改成背景图

      .img {
        margin-bottom: 4px;
        height: 24px;
        width: 24px;
        background-size: contain;
        background-position: center;
        background-repeat: no-repeat;
        border-radius: 2px;
      }

二、源码修改

找到你的项目中的node_modules/html2canvas/dist/html2canavs.js文件
然后搜索
CanvasRenderer.prototype.renderReplacedElement

 CanvasRenderer.prototype.renderReplacedElement = function (container, curves, image) {
			// 原来的代码 注释掉
            // if (image && container.intrinsicWidth > 0 && container.intrinsicHeight > 0) {
            //     var box = contentBox(container);
            //     var path = calculatePaddingBoxPath(curves);
            //     this.path(path);
            //     this.ctx.save();
            //     this.ctx.clip();
            //     this.ctx.drawImage(image, 0, 0, container.intrinsicWidth, container.intrinsicHeight, box.left, box.top, box.width, box.height);
            //     this.ctx.restore();
            // }
			// 改成下面的代码
			if (image && container.intrinsicWidth > 0 && container.intrinsicHeight > 0) {
			  var box = contentBox(container);
			  var path = calculatePaddingBoxPath(curves);

			  this.path(path);
			  this.ctx.save();
			  this.ctx.clip();

			  let newWidth;
			  let newHeight;
			  let newX = box.left;
			  let newY = box.top;

			  if(container.intrinsicWidth / box.width < container.intrinsicHeight / box.height) {
				newWidth = box.width;
				newHeight = container.intrinsicHeight * (box.width / container.intrinsicWidth);
				newY = box.top + (box.height - newHeight) / 2;
			  } else {
				newWidth = container.intrinsicWidth * (box.height / container.intrinsicHeight);
				newHeight = box.height;
				newX = box.left + (box.width - newWidth) / 2;
			  }

			  this.ctx.drawImage(image, 0, 0, container.intrinsicWidth, container.intrinsicHeight, newX, newY, newWidth, newHeight);
			  this.ctx.restore();
			}
        };