如何同步一系列承诺?
Promise.all([...])
sequence
function sequence(arr) {
return new Promise(function (resolve, reject) {
// try resolving all elements in 'arr',
// but strictly one after another;
});}编辑
sequence
function sequence(nextPromise) {
// while nextPromise() creates and returns another promise,
// continue resolving it;}解
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