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Promise循环依次执行ajax
2021-07-27 09:10:55
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``` var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9] function promiseForEach(arr, cb) { let realResult = [] let result = Promise.resolve() arr.forEach((a, index) => { result = result.then(() => { try { return cb(a).then((res) => { realResult.push(res) }) } catch (e) { } }) }) return result.then(() => { return realResult }) } promiseForEach(arr, (ele) => { return new Promise((resolve, reject) => { setTimeout(() => { console.log(ele) return resolve(ele) }, Math.random() * 1000) }) }).then((data) => { console.log("成功") console.log(data) }).catch((err) => { console.log("失败") console.log(err) }) ```
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