如何将Promise.all()与chrome.storage()结合使用? [英] How do I use Promise.all() with chrome.storage()?
问题描述
我有几个异步功能正在运行.我想等他们全部完成再采取下一步.这是我用来从chrome.storage
和Promise.all()
实现中获取所有键/值的代码.
I have several async functions running. I want to wait for them all to finish before taking the next steps. Here's my code that I'm using to get all of the key/values from chrome.storage
and the Promise.all()
implementation.
var promise1 = Promise.resolve(3);
var promise2 = 42;
var promise3 = new Promise(function(resolve, reject) {
setTimeout(resolve, 100, 'foo');
});
var getAll = chrome.storage.sync.get(function(result) {
console.log(result)
});
Promise.all([promise1, promise2, promise3, getAll]).then(function(values) {
console.log(values); // [3, 42, "foo", undefined]
});
不幸的是,这行不通.返回undefined
.
This doesn't work unfortunately. It returns undefined
.
Most of the code above is taken from MDN here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all
推荐答案
chrome.*
API不支持promise,它使用异步回调.
但是您可以拨通chrome.storage.sync.get
的电话:
The chrome.*
API does not support promises, it uses async callbacks.
But you can promisify your call to chrome.storage.sync.get
:
var getAllPromise = (function() {
return new Promise(function(resolve) {
chrome.storage.sync.get(function(result) {
resolve(result);
});
});
})();
Promise.all([getAllPromise]).then(...);
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