Access to XMLHttpRequest at 'https://realtymanage.oss-cn-hangzhou.aliyuncs.com/file/20200624140802.png' from origin 'http://localhost:8081' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
一直报这个错 使用canvas绘制完全空白 跪求大神
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