{"id":1360,"date":"2024-06-02T22:22:19","date_gmt":"2024-06-02T22:22:19","guid":{"rendered":""},"modified":"2024-06-05T03:08:19","modified_gmt":"2024-06-04T19:08:19","slug":"es6-%e7%b3%bb%e5%88%97%e4%b9%8b-babel-%e5%b0%86-async-%e7%bc%96%e8%af%91%e6%88%90%e4%ba%86%e4%bb%80%e4%b9%88%e6%a0%b7%e5%ad%90","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1360","title":{"rendered":"ES6 \u7cfb\u5217\u4e4b Babel \u5c06 Async \u7f16\u8bd1\u6210\u4e86\u4ec0\u4e48\u6837\u5b50"},"content":{"rendered":"\n

\u524d\u8a00<\/h2>\n

\u672c\u6587\u5c31\u662f\u7b80\u5355\u4ecb\u7ecd\u4e0b Async \u8bed\u6cd5\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u3002<\/p>\n

Async<\/h2>\n
<\/p>\n
const<\/span> fetchData<\/span> =<\/span> (<\/span>data<\/span>)<\/span> =><\/span> new<\/span> Promise<\/span>(<\/span>(<\/span>resolve<\/span>)<\/span> =><\/span> setTimeout<\/span>(<\/span>resolve<\/span>,<\/span> 1000<\/span>,<\/span> data<\/span> +<\/span> 1<\/span>)<\/span>)<\/span>\n\nconst<\/span> fetchValue<\/span> =<\/span> async<\/span> function<\/span> (<\/span>)<\/span> {<\/span>\n    var<\/span> value1<\/span> =<\/span> await<\/span> fetchData<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\n    var<\/span> value2<\/span> =<\/span> await<\/span> fetchData<\/span>(<\/span>value1<\/span>)<\/span>;<\/span>\n    var<\/span> value3<\/span> =<\/span> await<\/span> fetchData<\/span>(<\/span>value2<\/span>)<\/span>;<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>value3<\/span>)<\/span>\n}<\/span>;<\/span>\n\nfetchValue<\/span>(<\/span>)<\/span>;<\/span>\n\/\/ \u5927\u7ea6 3s \u540e\u8f93\u51fa 4<\/span><\/pre>\n<\/div>\n
Babel<\/h2>\n
\u6211\u4eec\u76f4\u63a5\u5728 Babel \u5b98\u7f51\u7684 Try it out<\/a> \u7c98\u8d34\u4e0a\u8ff0\u4ee3\u7801\uff0c\u7136\u540e\u67e5\u770b\u4ee3\u7801\u7f16\u8bd1\u6210\u4ec0\u4e48\u6837\u5b50\uff1a<\/p>\n
<\/p>\n
\"use strict\"<\/span>;<\/span>\n\nfunction<\/span> _asyncToGenerator<\/span>(<\/span>fn<\/span>)<\/span> {<\/span>\n  return<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n    var<\/span> gen<\/span> =<\/span> fn<\/span>.<\/span>apply<\/span>(<\/span>this<\/span>,<\/span> arguments<\/span>)<\/span>;<\/span>\n    return<\/span> new<\/span> Promise<\/span>(<\/span>function<\/span>(<\/span>resolve<\/span>,<\/span> reject<\/span>)<\/span> {<\/span>\n      function<\/span> step<\/span>(<\/span>key<\/span>,<\/span> arg<\/span>)<\/span> {<\/span>\n        try<\/span> {<\/span>\n          var<\/span> info<\/span> =<\/span> gen<\/span>[<\/span>key<\/span>]<\/span>(<\/span>arg<\/span>)<\/span>;<\/span>\n          var<\/span> value<\/span> =<\/span> info<\/span>.<\/span>value<\/span>;<\/span>\n        }<\/span> catch<\/span> (<\/span>error<\/span>)<\/span> {<\/span>\n          reject<\/span>(<\/span>error<\/span>)<\/span>;<\/span>\n          return<\/span>;<\/span>\n        }<\/span>\n        if<\/span> (<\/span>info<\/span>.<\/span>done<\/span>)<\/span> {<\/span>\n          resolve<\/span>(<\/span>value<\/span>)<\/span>;<\/span>\n        }<\/span> else<\/span> {<\/span>\n          return<\/span> Promise<\/span>.<\/span>resolve<\/span>(<\/span>value<\/span>)<\/span>.<\/span>then<\/span>(<\/span>\n            function<\/span>(<\/span>value<\/span>)<\/span> {<\/span>\n              step<\/span>(<\/span>\"next\"<\/span>,<\/span> value<\/span>)<\/span>;<\/span>\n            }<\/span>,<\/span>\n            function<\/span>(<\/span>err<\/span>)<\/span> {<\/span>\n              step<\/span>(<\/span>\"throw\"<\/span>,<\/span> err<\/span>)<\/span>;<\/span>\n            }<\/span>\n          )<\/span>;<\/span>\n        }<\/span>\n      }<\/span>\n      return<\/span> step<\/span>(<\/span>\"next\"<\/span>)<\/span>;<\/span>\n    }<\/span>)<\/span>;<\/span>\n  }<\/span>;<\/span>\n}<\/span>\n\nvar<\/span> fetchData<\/span> =<\/span> function<\/span> fetchData<\/span>(<\/span>data<\/span>)<\/span> {<\/span>\n  return<\/span> new<\/span> Promise<\/span>(<\/span>function<\/span>(<\/span>resolve<\/span>)<\/span> {<\/span>\n    return<\/span> setTimeout<\/span>(<\/span>resolve<\/span>,<\/span> 1000<\/span>,<\/span> data<\/span> +<\/span> 1<\/span>)<\/span>;<\/span>\n  }<\/span>)<\/span>;<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> fetchValue<\/span> =<\/span> (<\/span>function<\/span>(<\/span>)<\/span> {<\/span>\n  var<\/span> _ref<\/span> =<\/span> _asyncToGenerator<\/span>(<\/span>\n    \/*#__PURE__*\/<\/span> regeneratorRuntime<\/span>.<\/span>mark<\/span>(<\/span>function<\/span> _callee<\/span>(<\/span>)<\/span> {<\/span>\n      var<\/span> value1<\/span>,<\/span> value2<\/span>,<\/span> value3<\/span>;<\/span>\n      return<\/span> regeneratorRuntime<\/span>.<\/span>wrap<\/span>(<\/span>\n        function<\/span> _callee$<\/span>(<\/span>_context<\/span>)<\/span> {<\/span>\n          while<\/span> (<\/span>1<\/span>)<\/span> {<\/span>\n            switch<\/span> (<\/span>(<\/span>_context<\/span>.<\/span>prev<\/span> =<\/span> _context<\/span>.<\/span>next<\/span>)<\/span>)<\/span> {<\/span>\n              case<\/span> 0<\/span>:\n                _context<\/span>.<\/span>next<\/span> =<\/span> 2<\/span>;<\/span>\n                return<\/span> fetchData<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\n\n              case<\/span> 2<\/span>:\n                value1<\/span> =<\/span> _context<\/span>.<\/span>sent<\/span>;<\/span>\n                _context<\/span>.<\/span>next<\/span> =<\/span> 5<\/span>;<\/span>\n                return<\/span> fetchData<\/span>(<\/span>value1<\/span>)<\/span>;<\/span>\n\n              case<\/span> 5<\/span>:\n                value2<\/span> =<\/span> _context<\/span>.<\/span>sent<\/span>;<\/span>\n                _context<\/span>.<\/span>next<\/span> =<\/span> 8<\/span>;<\/span>\n                return<\/span> fetchData<\/span>(<\/span>value2<\/span>)<\/span>;<\/span>\n\n              case<\/span> 8<\/span>:\n                value3<\/span> =<\/span> _context<\/span>.<\/span>sent<\/span>;<\/span>\n\n                console<\/span>.<\/span>log<\/span>(<\/span>value3<\/span>)<\/span>;<\/span>\n\n              case<\/span> 10<\/span>:\n              case<\/span> \"end\"<\/span>:\n                return<\/span> _context<\/span>.<\/span>stop<\/span>(<\/span>)<\/span>;<\/span>\n            }<\/span>\n          }<\/span>\n        }<\/span>,<\/span>\n        _callee<\/span>,<\/span>\n        this<\/span>\n      )<\/span>;<\/span>\n    }<\/span>)<\/span>\n  )<\/span>;<\/span>\n\n  return<\/span> function<\/span> fetchValue<\/span>(<\/span>)<\/span> {<\/span>\n    return<\/span> _ref<\/span>.<\/span>apply<\/span>(<\/span>this<\/span>,<\/span> arguments<\/span>)<\/span>;<\/span>\n  }<\/span>;<\/span>\n}<\/span>)<\/span>(<\/span>)<\/span>;<\/span>\n\nfetchValue<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
_asyncToGenerator<\/h2>\n
regeneratorRuntime \u76f8\u5173\u7684\u4ee3\u7801\u6211\u4eec\u5728 \u300aES6 \u7cfb\u5217\u4e4b Babel \u5c06 Generator \u7f16\u8bd1\u6210\u4e86\u4ec0\u4e48\u6837\u5b50\u300b<\/a> \u4e2d\u5df2\u7ecf\u4ecb\u7ecd\u8fc7\u4e86\uff0c\u8fd9\u6b21\u6211\u4eec\u91cd\u70b9\u6765\u770b\u770b _asyncToGenerator \u51fd\u6570\uff1a<\/p>\n
<\/p>\n
function<\/span> _asyncToGenerator<\/span>(<\/span>fn<\/span>)<\/span> {<\/span>\n  return<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n    var<\/span> gen<\/span> =<\/span> fn<\/span>.<\/span>apply<\/span>(<\/span>this<\/span>,<\/span> arguments<\/span>)<\/span>;<\/span>\n    return<\/span> new<\/span> Promise<\/span>(<\/span>function<\/span>(<\/span>resolve<\/span>,<\/span> reject<\/span>)<\/span> {<\/span>\n      function<\/span> step<\/span>(<\/span>key<\/span>,<\/span> arg<\/span>)<\/span> {<\/span>\n        try<\/span> {<\/span>\n          var<\/span> info<\/span> =<\/span> gen<\/span>[<\/span>key<\/span>]<\/span>(<\/span>arg<\/span>)<\/span>;<\/span>\n          var<\/span> value<\/span> =<\/span> info<\/span>.<\/span>value<\/span>;<\/span>\n        }<\/span> catch<\/span> (<\/span>error<\/span>)<\/span> {<\/span>\n          reject<\/span>(<\/span>error<\/span>)<\/span>;<\/span>\n          return<\/span>;<\/span>\n        }<\/span>\n        if<\/span> (<\/span>info<\/span>.<\/span>done<\/span>)<\/span> {<\/span>\n          resolve<\/span>(<\/span>value<\/span>)<\/span>;<\/span>\n        }<\/span> else<\/span> {<\/span>\n          return<\/span> Promise<\/span>.<\/span>resolve<\/span>(<\/span>value<\/span>)<\/span>.<\/span>then<\/span>(<\/span>\n            function<\/span>(<\/span>value<\/span>)<\/span> {<\/span>\n              step<\/span>(<\/span>\"next\"<\/span>,<\/span> value<\/span>)<\/span>;<\/span>\n            }<\/span>,<\/span>\n            function<\/span>(<\/span>err<\/span>)<\/span> {<\/span>\n              step<\/span>(<\/span>\"throw\"<\/span>,<\/span> err<\/span>)<\/span>;<\/span>\n            }<\/span>\n          )<\/span>;<\/span>\n        }<\/span>\n      }<\/span>\n      return<\/span> step<\/span>(<\/span>\"next\"<\/span>)<\/span>;<\/span>\n    }<\/span>)<\/span>;<\/span>\n  }<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u4ee5\u4e0a\u8fd9\u6bb5\u4ee3\u7801\u4e3b\u8981\u662f\u7528\u6765\u5b9e\u73b0 generator \u7684\u81ea\u52a8\u6267\u884c\u4ee5\u53ca\u8fd4\u56de Promise\u3002<\/p>\n
\u5f53\u6211\u4eec\u6267\u884c fetchValue()<\/code> \u7684\u65f6\u5019\uff0c\u6267\u884c\u7684\u5176\u5b9e\u5c31\u662f _asyncToGenerator<\/code> \u8fd4\u56de\u7684\u8fd9\u4e2a\u533f\u540d\u51fd\u6570\uff0c\u5728\u533f\u540d\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u6267\u884c\u4e86<\/p>\n
\n
var<\/span> gen<\/span> =<\/span> fn<\/span>.<\/span>apply<\/span>(<\/span>this<\/span>,<\/span> arguments<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u8fd9\u4e00\u6b65\u5c31\u76f8\u5f53\u4e8e\u6267\u884c Generator \u51fd\u6570\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
function<\/span>*<\/span> helloWorldGenerator<\/span>(<\/span>)<\/span> {<\/span>\n  yield<\/span> 'hello'<\/span>;<\/span>\n  yield<\/span> 'world'<\/span>;<\/span>\n  return<\/span> 'ending'<\/span>;<\/span>\n}<\/span>\n\nvar<\/span> hw<\/span> =<\/span> helloWorldGenerator<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
var gen = fn.apply(this, arguments)<\/code> \u5c31\u76f8\u5f53\u4e8e var hw = helloWorldGenerator();<\/code>\uff0c\u8fd4\u56de\u7684 gen \u662f\u4e00\u4e2a\u5177\u6709 next()\u3001throw()\u3001return() \u65b9\u6cd5\u7684\u5bf9\u8c61\u3002<\/p>\n
\u7136\u540e\u6211\u4eec\u8fd4\u56de\u4e86\u4e00\u4e2a Promise \u5bf9\u8c61\uff0c\u5728 Promise \u4e2d\uff0c\u6211\u4eec\u6267\u884c\u4e86 step(“next”)\uff0cstep \u51fd\u6570\u4e2d\u4f1a\u6267\u884c\uff1a<\/p>\n
<\/p>\n
try<\/span> {<\/span>\n  var<\/span> info<\/span> =<\/span> gen<\/span>[<\/span>key<\/span>]<\/span>(<\/span>arg<\/span>)<\/span>;<\/span>\n  var<\/span> value<\/span> =<\/span> info<\/span>.<\/span>value<\/span>;<\/span>\n}<\/span> catch<\/span> (<\/span>error<\/span>)<\/span> {<\/span>\n  reject<\/span>(<\/span>error<\/span>)<\/span>;<\/span>\n  return<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
step(“next”) \u5c31\u76f8\u5f53\u4e8e var info = gen.next()<\/code>\uff0c\u8fd4\u56de\u7684 info \u5bf9\u8c61\u662f\u4e00\u4e2a\u5177\u6709 value \u548c done \u5c5e\u6027\u7684\u5bf9\u8c61\uff1a<\/p>\n
\n
{<\/span>value<\/span>: Promise<\/span>,<\/span> done<\/span>: false<\/span>}<\/span><\/pre>\n<\/div>\n
\u63a5\u4e0b\u6765\u53c8\u4f1a\u6267\u884c\uff1a<\/p>\n
<\/p>\n
if<\/span> (<\/span>info<\/span>.<\/span>done<\/span>)<\/span> {<\/span>\n  resolve<\/span>(<\/span>value<\/span>)<\/span>;<\/span>\n}<\/span> else<\/span> {<\/span>\n  return<\/span> Promise<\/span>.<\/span>resolve<\/span>(<\/span>value<\/span>)<\/span>.<\/span>then<\/span>(<\/span>\n    function<\/span>(<\/span>value<\/span>)<\/span> {<\/span>\n      step<\/span>(<\/span>\"next\"<\/span>,<\/span> value<\/span>)<\/span>;<\/span>\n    }<\/span>,<\/span>\n    function<\/span>(<\/span>err<\/span>)<\/span> {<\/span>\n      step<\/span>(<\/span>\"throw\"<\/span>,<\/span> err<\/span>)<\/span>;<\/span>\n    }<\/span>\n  )<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
value \u6b64\u65f6\u662f\u4e00\u4e2a Promise\uff0cPromise.resolve(value) \u4f9d\u7136\u4f1a\u8fd4\u56de\u8fd9\u4e2a Promise\uff0c\u6211\u4eec\u7ed9\u8fd9\u4e2a Promise \u6dfb\u52a0\u4e86\u4e00\u4e2a then \u51fd\u6570\uff0c\u7528\u4e8e\u5728 Promise \u6709\u7ed3\u679c\u65f6\u6267\u884c\uff0c\u6709\u7ed3\u679c\u65f6\u53c8\u4f1a\u6267\u884c step(\"next\", value)<\/code>\uff0c\u4ece\u800c\u4f7f\u5f97 Generator \u7ee7\u7eed\u6267\u884c\uff0c\u76f4\u5230 info.done<\/code> \u4e3a true\uff0c\u624d\u4f1a resolve(value)<\/code>\u3002<\/p>\n
\u4e0d\u5b8c\u6574\u4f46\u53ef\u7528\u7684\u4ee3\u7801<\/h2>\n
<\/p>\n
(<\/span>function<\/span>(<\/span>)<\/span> {<\/span>\n    var<\/span> ContinueSentinel<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n\n    var<\/span> mark<\/span> =<\/span> function<\/span>(<\/span>genFun<\/span>)<\/span> {<\/span>\n        var<\/span> generator<\/span> =<\/span> Object<\/span>.<\/span>create<\/span>(<\/span>{<\/span>\n            next<\/span>: function<\/span>(<\/span>arg<\/span>)<\/span> {<\/span>\n                return<\/span> this<\/span>.<\/span>_invoke<\/span>(<\/span>\"next\"<\/span>,<\/span> arg<\/span>)<\/span>;<\/span>\n            }<\/span>\n        }<\/span>)<\/span>;<\/span>\n        genFun<\/span>.<\/span>prototype<\/span> =<\/span> generator<\/span>;<\/span>\n        return<\/span> genFun<\/span>;<\/span>\n    }<\/span>;<\/span>\n\n    function<\/span> wrap<\/span>(<\/span>innerFn<\/span>,<\/span> outerFn<\/span>,<\/span> self<\/span>)<\/span> {<\/span>\n        var<\/span> generator<\/span> =<\/span> Object<\/span>.<\/span>create<\/span>(<\/span>outerFn<\/span>.<\/span>prototype<\/span>)<\/span>;<\/span>\n\n        var<\/span> context<\/span> =<\/span> {<\/span>\n            done<\/span>: false<\/span>,<\/span>\n            method<\/span>: \"next\"<\/span>,<\/span>\n            next<\/span>: 0<\/span>,<\/span>\n            prev<\/span>: 0<\/span>,<\/span>\n            sent<\/span>: undefined<\/span>,<\/span>\n            abrupt<\/span>: function<\/span>(<\/span>type<\/span>,<\/span> arg<\/span>)<\/span> {<\/span>\n                var<\/span> record<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n                record<\/span>.<\/span>type<\/span> =<\/span> type<\/span>;<\/span>\n                record<\/span>.<\/span>arg<\/span> =<\/span> arg<\/span>;<\/span>\n\n                return<\/span> this<\/span>.<\/span>complete<\/span>(<\/span>record<\/span>)<\/span>;<\/span>\n            }<\/span>,<\/span>\n            complete<\/span>: function<\/span>(<\/span>record<\/span>,<\/span> afterLoc<\/span>)<\/span> {<\/span>\n                if<\/span> (<\/span>record<\/span>.<\/span>type<\/span> ===<\/span> \"return\"<\/span>)<\/span> {<\/span>\n                    this<\/span>.<\/span>rval<\/span> =<\/span> this<\/span>.<\/span>arg<\/span> =<\/span> record<\/span>.<\/span>arg<\/span>;<\/span>\n                    this<\/span>.<\/span>method<\/span> =<\/span> \"return\"<\/span>;<\/span>\n                    this<\/span>.<\/span>next<\/span> =<\/span> \"end\"<\/span>;<\/span>\n                }<\/span>\n\n                return<\/span> ContinueSentinel<\/span>;<\/span>\n            }<\/span>,<\/span>\n            stop<\/span>: function<\/span>(<\/span>)<\/span> {<\/span>\n                this<\/span>.<\/span>done<\/span> =<\/span> true<\/span>;<\/span>\n                return<\/span> this<\/span>.<\/span>rval<\/span>;<\/span>\n            }<\/span>\n        }<\/span>;<\/span>\n\n        generator<\/span>.<\/span>_invoke<\/span> =<\/span> makeInvokeMethod<\/span>(<\/span>innerFn<\/span>,<\/span> context<\/span>)<\/span>;<\/span>\n\n        return<\/span> generator<\/span>;<\/span>\n    }<\/span>\n\n    function<\/span> makeInvokeMethod<\/span>(<\/span>innerFn<\/span>,<\/span> context<\/span>)<\/span> {<\/span>\n        var<\/span> state<\/span> =<\/span> \"start\"<\/span>;<\/span>\n\n        return<\/span> function<\/span> invoke<\/span>(<\/span>method<\/span>,<\/span> arg<\/span>)<\/span> {<\/span>\n            if<\/span> (<\/span>state<\/span> ===<\/span> \"completed\"<\/span>)<\/span> {<\/span>\n                return<\/span> {<\/span> value<\/span>: undefined<\/span>,<\/span> done<\/span>: true<\/span> }<\/span>;<\/span>\n            }<\/span>\n\n            context<\/span>.<\/span>method<\/span> =<\/span> method<\/span>;<\/span>\n            context<\/span>.<\/span>arg<\/span> =<\/span> arg<\/span>;<\/span>\n\n            while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>\n                state<\/span> =<\/span> \"executing\"<\/span>;<\/span>\n\n                if<\/span> (<\/span>context<\/span>.<\/span>method<\/span> ===<\/span> \"next\"<\/span>)<\/span> {<\/span>\n                    context<\/span>.<\/span>sent<\/span> =<\/span> context<\/span>.<\/span>_sent<\/span> =<\/span> context<\/span>.<\/span>arg<\/span>;<\/span>\n                }<\/span>\n\n                var<\/span> record<\/span> =<\/span> {<\/span>\n                    type<\/span>: \"normal\"<\/span>,<\/span>\n                    arg<\/span>: innerFn<\/span>.<\/span>call<\/span>(<\/span>self<\/span>,<\/span> context<\/span>)<\/span>\n                }<\/span>;<\/span>\n\n                if<\/span> (<\/span>record<\/span>.<\/span>type<\/span> ===<\/span> \"normal\"<\/span>)<\/span> {<\/span>\n                    state<\/span> =<\/span> context<\/span>.<\/span>done<\/span> ? \"completed\"<\/span> : \"yield\"<\/span>;<\/span>\n\n                    if<\/span> (<\/span>record<\/span>.<\/span>arg<\/span> ===<\/span> ContinueSentinel<\/span>)<\/span> {<\/span>\n                        continue<\/span>;<\/span>\n                    }<\/span>\n\n                    return<\/span> {<\/span>\n                        value<\/span>: record<\/span>.<\/span>arg<\/span>,<\/span>\n                        done<\/span>: context<\/span>.<\/span>done<\/span>\n                    }<\/span>;<\/span>\n                }<\/span>\n            }<\/span>\n        }<\/span>;<\/span>\n    }<\/span>\n\n    window<\/span>.<\/span>regeneratorRuntime<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n\n    regeneratorRuntime<\/span>.<\/span>wrap<\/span> =<\/span> wrap<\/span>;<\/span>\n    regeneratorRuntime<\/span>.<\/span>mark<\/span> =<\/span> mark<\/span>;<\/span>\n}<\/span>)<\/span>(<\/span>)<\/span>;<\/span>\n\n\"use strict\"<\/span>;<\/span>\n\nfunction<\/span> _asyncToGenerator<\/span>(<\/span>fn<\/span>)<\/span> {<\/span>\n    return<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n        var<\/span> gen<\/span> =<\/span> fn<\/span>.<\/span>apply<\/span>(<\/span>this<\/span>,<\/span> arguments<\/span>)<\/span>;<\/span>\n        return<\/span> new<\/span> Promise<\/span>(<\/span>function<\/span>(<\/span>resolve<\/span>,<\/span> reject<\/span>)<\/span> {<\/span>\n            function<\/span> step<\/span>(<\/span>key<\/span>,<\/span> arg<\/span>)<\/span> {<\/span>\n                try<\/span> {<\/span>\n                    var<\/span> info<\/span> =<\/span> gen<\/span>[<\/span>key<\/span>]<\/span>(<\/span>arg<\/span>)<\/span>;<\/span>\n                    var<\/span> value<\/span> =<\/span> info<\/span>.<\/span>value<\/span>;<\/span>\n                }<\/span> catch<\/span> (<\/span>error<\/span>)<\/span> {<\/span>\n                    reject<\/span>(<\/span>error<\/span>)<\/span>;<\/span>\n                    return<\/span>;<\/span>\n                }<\/span>\n                if<\/span> (<\/span>info<\/span>.<\/span>done<\/span>)<\/span> {<\/span>\n                    resolve<\/span>(<\/span>value<\/span>)<\/span>;<\/span>\n                }<\/span> else<\/span> {<\/span>\n                    return<\/span> Promise<\/span>.<\/span>resolve<\/span>(<\/span>value<\/span>)<\/span>.<\/span>then<\/span>(<\/span>\n                        function<\/span>(<\/span>value<\/span>)<\/span> {<\/span>\n                            step<\/span>(<\/span>\"next\"<\/span>,<\/span> value<\/span>)<\/span>;<\/span>\n                        }<\/span>,<\/span>\n                        function<\/span>(<\/span>err<\/span>)<\/span> {<\/span>\n                            step<\/span>(<\/span>\"throw\"<\/span>,<\/span> err<\/span>)<\/span>;<\/span>\n                        }<\/span>\n                    )<\/span>;<\/span>\n                }<\/span>\n            }<\/span>\n            return<\/span> step<\/span>(<\/span>\"next\"<\/span>)<\/span>;<\/span>\n        }<\/span>)<\/span>;<\/span>\n    }<\/span>;<\/span>\n}<\/span>\n\nvar<\/span> fetchData<\/span> =<\/span> function<\/span> fetchData<\/span>(<\/span>data<\/span>)<\/span> {<\/span>\n    return<\/span> new<\/span> Promise<\/span>(<\/span>function<\/span>(<\/span>resolve<\/span>)<\/span> {<\/span>\n        return<\/span> setTimeout<\/span>(<\/span>resolve<\/span>,<\/span> 1000<\/span>,<\/span> data<\/span> +<\/span> 1<\/span>)<\/span>;<\/span>\n    }<\/span>)<\/span>;<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> fetchValue<\/span> =<\/span> (<\/span>function<\/span>(<\/span>)<\/span> {<\/span>\n    var<\/span> _ref<\/span> =<\/span> _asyncToGenerator<\/span>(<\/span>\n        \/*#__PURE__*\/<\/span>\n        regeneratorRuntime<\/span>.<\/span>mark<\/span>(<\/span>function<\/span> _callee<\/span>(<\/span>)<\/span> {<\/span>\n            var<\/span> value1<\/span>,<\/span> value2<\/span>,<\/span> value3<\/span>;<\/span>\n            return<\/span> regeneratorRuntime<\/span>.<\/span>wrap<\/span>(<\/span>\n                function<\/span> _callee$<\/span>(<\/span>_context<\/span>)<\/span> {<\/span>\n                    while<\/span> (<\/span>1<\/span>)<\/span> {<\/span>\n                        switch<\/span> (<\/span>(<\/span>_context<\/span>.<\/span>prev<\/span> =<\/span> _context<\/span>.<\/span>next<\/span>)<\/span>)<\/span> {<\/span>\n                            case<\/span> 0<\/span>:\n                                _context<\/span>.<\/span>next<\/span> =<\/span> 2<\/span>;<\/span>\n                                return<\/span> fetchData<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\n\n                            case<\/span> 2<\/span>:\n                                value1<\/span> =<\/span> _context<\/span>.<\/span>sent<\/span>;<\/span>\n                                _context<\/span>.<\/span>next<\/span> =<\/span> 5<\/span>;<\/span>\n                                return<\/span> fetchData<\/span>(<\/span>value1<\/span>)<\/span>;<\/span>\n\n                            case<\/span> 5<\/span>:\n                                value2<\/span> =<\/span> _context<\/span>.<\/span>sent<\/span>;<\/span>\n                                _context<\/span>.<\/span>next<\/span> =<\/span> 8<\/span>;<\/span>\n                                return<\/span> fetchData<\/span>(<\/span>value2<\/span>)<\/span>;<\/span>\n\n                            case<\/span> 8<\/span>:\n                                value3<\/span> =<\/span> _context<\/span>.<\/span>sent<\/span>;<\/span>\n\n                                console<\/span>.<\/span>log<\/span>(<\/span>value3<\/span>)<\/span>;<\/span>\n\n                            case<\/span> 10<\/span>:\n                            case<\/span> \"end\"<\/span>:\n                                return<\/span> _context<\/span>.<\/span>stop<\/span>(<\/span>)<\/span>;<\/span>\n                        }<\/span>\n                    }<\/span>\n                }<\/span>,<\/span>\n                _callee<\/span>,<\/span>\n                this<\/span>\n            )<\/span>;<\/span>\n        }<\/span>)<\/span>\n    )<\/span>;<\/span>\n\n    return<\/span> function<\/span> fetchValue<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> _ref<\/span>.<\/span>apply<\/span>(<\/span>this<\/span>,<\/span> arguments<\/span>)<\/span>;<\/span>\n    }<\/span>;<\/span>\n}<\/span>)<\/span>(<\/span>)<\/span>;<\/span>\n\nfetchValue<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u8bf7\u539f\u8c05\u6211\u6c34\u4e86\u4e00\u7bc7\u6587\u7ae0\u2026\u2026<\/p>\n
ES6 \u7cfb\u5217<\/h2>\n
ES6 \u7cfb\u5217\u76ee\u5f55\u5730\u5740\uff1ahttps:\/\/github.com\/mqyqingfeng\/Blog<\/a><\/p>\n
ES6 \u7cfb\u5217\u9884\u8ba1\u5199\u4e8c\u5341\u7bc7\u5de6\u53f3\uff0c\u65e8\u5728\u52a0\u6df1 ES6 \u90e8\u5206\u77e5\u8bc6\u70b9\u7684\u7406\u89e3\uff0c\u91cd\u70b9\u8bb2\u89e3\u5757\u7ea7\u4f5c\u7528\u57df\u3001\u6807\u7b7e\u6a21\u677f\u3001\u7bad\u5934\u51fd\u6570\u3001Symbol\u3001Set\u3001Map \u4ee5\u53ca Promise \u7684\u6a21\u62df\u5b9e\u73b0\u3001\u6a21\u5757\u52a0\u8f7d\u65b9\u6848\u3001\u5f02\u6b65\u5904\u7406\u7b49\u5185\u5bb9\u3002<\/p>\n<\/td>\n
\u6587\u7ae0\u8f6c\u8f7d\u81eahttps:\/\/github.com\/mqyqingfeng\/Blog\/issues\/103<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u524d\u8a00 \u672c\u6587\u5c31\u662f\u7b80\u5355\u4ecb\u7ecd\u4e0b Async \u8bed\u6cd5\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u3002 Async const fetchData = (data) => new Promise((r…<\/p>\n
 Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1360","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1360"}],"collection":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1360"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1360\/revisions"}],"predecessor-version":[{"id":1453,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1360\/revisions\/1453"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}