跨域

Access to image at 'img url 地址 ' from origin 'url 当前域' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

url（当前域） 访问 img url （地址域）出现跨域
img url（地址域） 需要设置响应头 Access-Control-Allow-Origin: *
net::ERR_FAILED

origin xxx is not allowed by Access-control-allow-origin

ios Safari XMLHttpRequest cannot load xxx due to access control checks