CORS

わからん

code:js

a.then(finalResult => {

console.log(finalResult);

})

code:js

caches.open('image-2020-02-26').then(function(cache){

cache.keys().then(function(cachedRequests){

console.log(cachedRequests)

})

})

code:out.json

length: 3

__proto__: Array(0)

code:out.txt

Access to fetch at '*.png' from origin 'HOST' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

参考