为什么当我使用 fetch 从禁用响应 CORS 标头的服务器加载数据时，我预期会收到错误：
Failed to load http://www.imgworlds.com/wp-content/uploads/2015/12/18-CONTACTUS-HEADER.jpg: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:63343' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
但显示了来自 img 标签的图像
<script>
fetch('http://www.imgworlds.com/wp-content/uploads/2015/12/18-CONTACTUS-HEADER.jpg').then(console.log);
</script>
<img src="http://www.imgworlds.com/wp-content/uploads/2015/12/18-CONTACTUS-HEADER.jpg">
跨域共享标准不包括img标签，但 XHR/fetch 请求和某些情况（包括将图像绘制到画布）会这样做。
欲了解更多信息：https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#What_requests_use_CORS https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#What_requests_use_CORS
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