async异步 await等待

/*** Copyright (c) 2014-present, Facebook, Inc.** This source code is licensed under the MIT license found in the* LICENSE file in the root directory of this source tree.*/var regeneratorRuntime = (function (exports) {"use strict";var Op = Object.prototype;var hasOwn = Op.hasOwnProperty;var undefined; // More compressible than void 0.var $Symbol = typeof Symbol === "function" ? Symbol : {};var iteratorSymbol = $Symbol.iterator || "@@iterator";var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";function wrap(innerFn, outerFn, self, tryLocsList) {// If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;var generator = Object.create(protoGenerator.prototype);var context = new Context(tryLocsList || []);// The ._invoke method unifies the implementations of the .next,// .throw, and .return methods.generator._invoke = makeInvokeMethod(innerFn, self, context);return generator;}exports.wrap = wrap;// Try/catch helper to minimize deoptimizations. Returns a completion// record like context.tryEntries[i].completion. This interface could// have been (and was previously) designed to take a closure to be// invoked without arguments, but in all the cases we care about we// already have an existing method we want to call, so there's no need// to create a new function object. We can even get away with assuming// the method takes exactly one argument, since that happens to be true// in every case, so we don't have to touch the arguments object. The// only additional allocation required is the completion record, which// has a stable shape and so hopefully should be cheap to allocate.function tryCatch(fn, obj, arg) {try {return { type: "normal", arg: fn.call(obj, arg) };} catch (err) {return { type: "throw", arg: err };}}var GenStateSuspendedStart = "suspendedStart";var GenStateSuspendedYield = "suspendedYield";var GenStateExecuting = "executing";var GenStateCompleted = "completed";// Returning this object from the innerFn has the same effect as// breaking out of the dispatch switch statement.var ContinueSentinel = {};// Dummy constructor functions that we use as the .constructor and// .constructor.prototype properties for functions that return Generator// objects. For full spec compliance, you may wish to configure your// minifier not to mangle the names of these two functions.function Generator() {}function GeneratorFunction() {}function GeneratorFunctionPrototype() {}// This is a polyfill for %IteratorPrototype% for environments that// don't natively support it.var IteratorPrototype = {};IteratorPrototype[iteratorSymbol] = function () {return this;};var getProto = Object.getPrototypeOf;var NativeIteratorPrototype = getProto && getProto(getProto(values([])));if (NativeIteratorPrototype &&NativeIteratorPrototype !== Op &&hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {// This environment has a native %IteratorPrototype%; use it instead// of the polyfill.IteratorPrototype = NativeIteratorPrototype;}var Gp = GeneratorFunctionPrototype.prototype =Generator.prototype = Object.create(IteratorPrototype);GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;GeneratorFunctionPrototype.constructor = GeneratorFunction;GeneratorFunctionPrototype[toStringTagSymbol] =GeneratorFunction.displayName = "GeneratorFunction";// Helper for defining the .next, .throw, and .return methods of the// Iterator interface in terms of a single ._invoke method.function defineIteratorMethods(prototype) {["next", "throw", "return"].forEach(function(method) {prototype[method] = function(arg) {return this._invoke(method, arg);};});}exports.isGeneratorFunction = function(genFun) {var ctor = typeof genFun === "function" && genFun.constructor;return ctor? ctor === GeneratorFunction ||// For the native GeneratorFunction constructor, the best we can// do is to check its .name property.(ctor.displayName || ctor.name) === "GeneratorFunction": false;};exports.mark = function(genFun) {if (Object.setPrototypeOf) {Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);} else {genFun.__proto__ = GeneratorFunctionPrototype;if (!(toStringTagSymbol in genFun)) {genFun[toStringTagSymbol] = "GeneratorFunction";}}genFun.prototype = Object.create(Gp);return genFun;};// Within the body of any async function, `await x` is transformed to// `yield regeneratorRuntime.awrap(x)`, so that the runtime can test// `hasOwn.call(value, "__await")` to determine if the yielded value is// meant to be awaited.exports.awrap = function(arg) {return { __await: arg };};function AsyncIterator(generator) {function invoke(method, arg, resolve, reject) {var record = tryCatch(generator[method], generator, arg);if (record.type ===