在 JavaScript 中使用之前，如何強制函式解決掛起的承諾
generateKey(pass, iter).then(function(result) {
Pkey = result;
});
<empty string>在解決之前Pkey 回傳上方我可以撰寫一個回圈來檢查非空，但這似乎違反直覺，不是嗎？
和
Pkey = generateKey(pass, iter);
回傳一個最終完成的未決承諾
function generateKey(passwd, iterations) {
var encoder = new TextEncoder('utf-8');
var passphraseKey = encoder.encode(passwd);
var saltBuffer = encoder.encode("carthage");
return crypto.subtle.importKey(
'raw',
passphraseKey,
{name: 'PBKDF2'},
false,
['deriveBits', 'deriveKey']
).then(function(key) {
// console.log(key);
return window.crypto.subtle.deriveKey(
{ "name": 'PBKDF2',
"salt": saltBuffer,
"iterations": iterations,
"hash": 'SHA-256'
},
key,
{ "name": 'AES-CBC',
"length": 256
},
true,
[ "encrypt", "decrypt" ]
)
}).then(function (webKey) {
// console.log(webKey);
return crypto.subtle.exportKey("raw", webKey);
}).then(function (buffer) {
// console.log(buffer);
// console.log(saltBuffer);
// console.log("Private Key = " buf2hex(buffer));
// console.log("Salt = " bytesToHexString(saltBuffer));
return buffer;
});
}
function buf2hex(buffer) { // buffer is an ArrayBuffer
return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' x.toString(16)).slice(-2)).join('');
}
function bytesToHexString(byteArray) {
return Array.prototype.map.call(byteArray, function(byte) {
return ('0' (byte & 0xFF).toString(16)).slice(-2);
}).join('');
}
uj5u.com熱心網友回復：
您可以使用async & await如下
async function generateKey(passwd, iterations) {...}
...
Pkey = await generateKey(pass, iter);
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標籤：javascript 异步 承诺