添加跨域条件 crossorigin="anonymous"
【Redirect at origin ‘http://xxx.xx.com‘ has been blocked from loading by Cross-Origin Resource Sharing
policy: No ‘Access-Control-Allow-Origin‘ header is present on the requested resource. Origin ‘http://sub2.xx.com‘ is therefore not allowed access.】
var img = new Image;img.onload = myLoader;img.crossOrigin = ‘anonymous‘; //可选值：anonymous，* img.src = ‘http://....‘;或者是HTML中 <img src="" id="" crossorigin="anonymous">
视频的话同上，<video width="320" height="240" controls="controls" crossorigin="anonymous"></video>
如果视频 video.crossOrigin = ‘anonymous‘; 报错的话，可以在标签上面加该属性。
个人博客 ：很多好用的 npm 包 ， 可以看看 https://gilea.cn/
github: https://github.com/longfei59418888/vui （很不错的vue2.0组件库，记得给一个 start,以后有一起讨论，各种好组件）
Failed to execute 'toDataURL' on 'HTMLCanvasElement,在canvas.toDataURL()执行时候报错解决方案
原文地址：https://www.cnblogs.com/jiebba/p/9733826.html