EcKeyImportParamsdictionary of the Web 加密 API represents the object that should be passed as the
SubtleCrypto.unwrapKey(), when generating any elliptic-curve-based key pair: that is, when the algorithm is identified as either of ECDSA or ECDH .
DOMString. This should be set to
ECDH, depending on the algorithm you want to use.
See the examples for
Web Cryptography API
The definition of 'SubtleCrypto.EcKeyImportParams' in that specification.