如果后端返回的数据已经带了图片格式前缀,那么直接放入src即可显示.(data:image/png;base64,)
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIIAAAAgCAIAAABRtT dPAAANBElEQVR42u1aC0xUVxo223spttu5iNsWbX7G7TfbhpGte2GlvpQ6Pbxy 5dSWrjdnVrYUBtBVF8gCK0PCoFURFZUKmIsUqBV+Blo....................
没带,则手动拼接上即可
this.imgsrc = "data:image/png;base64," + res.data.imageBase64;
