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use generator like async/await
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| /* library function */ | |
| function async(args, gen){ | |
| return new Promise((resolve, reject) => { | |
| var ite = gen(...args) | |
| !function recur(pre_value){ | |
| var ret = ite.next(pre_value) | |
| ret.done ? resolve(ret.value) : ret.value.then(recur) | |
| }() | |
| }) | |
| } | |
| /* sample 1 */ | |
| function wait(msec){ | |
| return new Promise((resolve, reject) => { | |
| setTimeout(resolve, msec) | |
| }) | |
| } | |
| function async_test(){ | |
| return async(arguments, function*(a,b){ | |
| console.log("wait", Date.now()) | |
| yield wait(1000) | |
| console.log("waitend", Date.now()) | |
| console.log(a, b) | |
| }) | |
| } | |
| async_test(1, 2) | |
| // wait 1455961206662 | |
| // waitend 1455961207666 | |
| // 1 2 | |
| /* sample 2 */ | |
| function test(){return async(arguments, function*(){ | |
| var f1 = fetch("/").then(e => e.text()) | |
| var f2 = fetch("/test.jpg").then(e => e.blob()) | |
| var text = yield f1 | |
| console.log(text.substr(0,14)) | |
| var blob = yield f2 | |
| console.log(blob) | |
| })} | |
| test() | |
| // <!doctype html | |
| // Blob {} |
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| function acall(gen, ...args){ | |
| var ite = gen(...args) | |
| !function recur(pre_value){ | |
| var ret = ite.next(pre_value) | |
| ret.done || ret.value(recur) | |
| }() | |
| } | |
| function afunc(fn, ...args){ | |
| return cb => fn(...args, cb) | |
| } | |
| function httpGet(url, cb){ | |
| fetch(url).then(e => e.text()).then(e => cb(e)) | |
| } | |
| function wait(msec, cb){ | |
| setTimeout(cb, msec) | |
| } | |
| function* sample_gen(message){ | |
| console.log("wait", Date.now()) | |
| yield afunc(wait, 1000) | |
| console.log("waitend", Date.now()) | |
| var text = yield afunc(httpGet, "/") | |
| console.log(message) | |
| console.log(text) | |
| } | |
| acall(sample_gen, "この後にURLのデータ：") |
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| wait 1455345512307 | |
| waitend 1455345513308 | |
| この後にURLのデータ： | |
| <?xml version="1.0" encoding="UTF-8" ?> | |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTM............... |
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