{"id":1361,"date":"2024-06-02T22:22:26","date_gmt":"2024-06-02T22:22:26","guid":{"rendered":""},"modified":"2024-06-05T03:09:46","modified_gmt":"2024-06-04T19:09:46","slug":"es6-%e7%b3%bb%e5%88%97%e4%b9%8b-babel-%e5%b0%86-generator-%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=1361","title":{"rendered":"ES6 \u7cfb\u5217\u4e4b Babel \u5c06 Generator \u7f16\u8bd1\u6210\u4e86\u4ec0\u4e48\u6837\u5b50"},"content":{"rendered":"\n

\u524d\u8a00<\/h2>\n

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

Generator<\/h2>\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><\/pre>\n<\/div>\n
\u6211\u4eec\u6253\u5370\u4e0b\u6267\u884c\u7684\u7ed3\u679c\uff1a<\/p>\n
<\/p>\n
var<\/span> hw<\/span> =<\/span> helloWorldGenerator<\/span>(<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>hw<\/span>.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ {value: \"hello\", done: false}<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>hw<\/span>.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ {value: \"world\", done: false}<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>hw<\/span>.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ {value: \"ending\", done: true}<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>hw<\/span>.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ {value: undefined, done: true}<\/span><\/pre>\n<\/div>\n
Babel<\/h2>\n
\u5177\u4f53\u7684\u6267\u884c\u8fc7\u7a0b\u5c31\u4e0d\u8bf4\u4e86\uff0c\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\u88ab\u7f16\u8bd1\u6210\u4e86\u4ec0\u4e48\u6837\u5b50\uff1a<\/p>\n
<\/p>\n
\/**<\/span>\n * \u6211\u4eec\u5c31\u79f0\u547c\u8fd9\u4e2a\u7248\u672c\u4e3a\u7b80\u5355\u7f16\u8bd1\u7248\u672c\u5427<\/span>\n *\/<\/span>\nvar<\/span> _marked<\/span> =<\/span> \/*#__PURE__*\/<\/span> regeneratorRuntime<\/span>.<\/span>mark<\/span>(<\/span>helloWorldGenerator<\/span>)<\/span>;<\/span>\n\nfunction<\/span> helloWorldGenerator<\/span>(<\/span>)<\/span> {<\/span>\n  return<\/span> regeneratorRuntime<\/span>.<\/span>wrap<\/span>(<\/span>\n    function<\/span> helloWorldGenerator$<\/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> \"hello\"<\/span>;<\/span>\n\n          case<\/span> 2<\/span>:\n            _context<\/span>.<\/span>next<\/span> =<\/span> 4<\/span>;<\/span>\n            return<\/span> \"world\"<\/span>;<\/span>\n\n          case<\/span> 4<\/span>:\n            return<\/span> _context<\/span>.<\/span>abrupt<\/span>(<\/span>\"return\"<\/span>,<\/span> \"ending\"<\/span>)<\/span>;<\/span>\n\n          case<\/span> 5<\/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    _marked<\/span>,<\/span>\n    this<\/span>\n  )<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u731b\u4e00\u770b\uff0c\u597d\u50cf\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u8fd8\u86ee\u5c11\u7684\uff0c\u4f46\u662f\u7ec6\u7ec6\u4e00\u770b\uff0c\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u80af\u5b9a\u662f\u4e0d\u80fd\u7528\u7684\u5440\uff0cregeneratorRuntime<\/code> \u662f\u4e2a\u4ec0\u4e48\u9b3c\uff1f\u54ea\u91cc\u6709\u58f0\u660e\u5440\uff1fmark<\/code> \u548c wrap<\/code> \u65b9\u6cd5\u53c8\u90fd\u505a\u4e86\u4ec0\u4e48\uff1f<\/p>\n
\u96be\u9053\u5c31\u4e0d\u80fd\u7f16\u8bd1\u4e00\u4e2a\u5b8c\u6574\u53ef\u7528\u7684\u4ee3\u7801\u5417\uff1f<\/p>\n
regenerator<\/h2>\n
\u5982\u679c\u4f60\u60f3\u770b\u5230\u5b8c\u6574\u53ef\u7528\u7684\u4ee3\u7801\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 regenerator<\/a>\uff0c\u8fd9\u662f facebook \u4e0b\u7684\u4e00\u4e2a\u5de5\u5177\uff0c\u7528\u4e8e\u7f16\u8bd1 ES6 \u7684 generator \u51fd\u6570\u3002<\/p>\n
\u6211\u4eec\u5148\u5b89\u88c5\u4e00\u4e0b regenerator\uff1a<\/p>\n
\n
npm install -g regenerator<\/pre>\n<\/div>\n
\u7136\u540e\u65b0\u5efa\u4e00\u4e2a generator.js \u6587\u4ef6\uff0c\u91cc\u9762\u7684\u4ee3\u7801\u5c31\u662f\u6587\u7ae0\u6700\u4e00\u5f00\u59cb\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u6267\u884c\u547d\u4ee4\uff1a<\/p>\n
\n
regenerator --include-runtime generator.js ><\/span> generator-es5.js<\/pre>\n<\/div>\n
\u6211\u4eec\u5c31\u53ef\u4ee5\u5728 generator-es5.js \u6587\u4ef6\u770b\u5230\u7f16\u8bd1\u540e\u7684\u5b8c\u6574\u53ef\u7528\u7684\u4ee3\u7801\u3002<\/p>\n
\u800c\u8fd9\u4e00\u7f16\u8bd1\u5c31\u7f16\u8bd1\u4e86 700 \u591a\u884c\u2026\u2026 \u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u53ef\u4ee5\u67e5\u770b generator-es5.js<\/a><\/p>\n
\u603b\u4e4b\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u8fd8\u86ee\u590d\u6742\uff0c\u6211\u4eec\u53ef\u4ee5\u4ece\u4e2d\u62bd\u79bb\u51fa\u5927\u81f4\u7684\u903b\u8f91\uff0c\u81f3\u5c11\u8ba9\u7b80\u5355\u7f16\u8bd1\u7684\u90a3\u6bb5\u4ee3\u7801\u80fd\u591f\u8dd1\u8d77\u6765\u3002<\/p>\n
mark \u51fd\u6570<\/h2>\n
\u7b80\u5355\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7b2c\u4e00\u6bb5\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
\n
var<\/span> _marked<\/span> =<\/span> \/*#__PURE__*\/<\/span> regeneratorRuntime<\/span>.<\/span>mark<\/span>(<\/span>helloWorldGenerator<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u67e5\u770b\u5b8c\u6574\u7f16\u8bd1\u7248\u672c\u4e2d mark \u51fd\u6570\u7684\u6e90\u7801\uff1a<\/p>\n
<\/p>\n
runtime<\/span>.<\/span>mark<\/span> =<\/span> function<\/span>(<\/span>genFun<\/span>)<\/span> {<\/span>\n  genFun<\/span>.<\/span>__proto__<\/span> =<\/span> GeneratorFunctionPrototype<\/span>;<\/span>\n  genFun<\/span>.<\/span>prototype<\/span> =<\/span> Object<\/span>.<\/span>create<\/span>(<\/span>Gp<\/span>)<\/span>;<\/span>\n  return<\/span> genFun<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
\u8fd9\u5176\u4e2d\u53c8\u6d89\u53ca\u4e86 GeneratorFunctionPrototype \u548c Gp \u53d8\u91cf\uff0c\u6211\u4eec\u4e5f\u67e5\u770b\u4e0b\u5bf9\u5e94\u7684\u4ee3\u7801\uff1a<\/p>\n
<\/p>\n
function<\/span> Generator<\/span>(<\/span>)<\/span> {<\/span>}<\/span>\nfunction<\/span> GeneratorFunction<\/span>(<\/span>)<\/span> {<\/span>}<\/span>\nfunction<\/span> GeneratorFunctionPrototype<\/span>(<\/span>)<\/span> {<\/span>}<\/span>\n\n.<\/span>.<\/span>.<\/span>\n\nvar<\/span> Gp<\/span> =<\/span> GeneratorFunctionPrototype<\/span>.<\/span>prototype<\/span> =<\/span>\n  Generator<\/span>.<\/span>prototype<\/span> =<\/span> Object<\/span>.<\/span>create<\/span>(<\/span>IteratorPrototype<\/span>)<\/span>;<\/span>\n\nGeneratorFunction<\/span>.<\/span>prototype<\/span> =<\/span> Gp<\/span>.<\/span>constructor<\/span> =<\/span> GeneratorFunctionPrototype<\/span>;<\/span>\n\nGeneratorFunctionPrototype<\/span>.<\/span>constructor<\/span> =<\/span> GeneratorFunction<\/span>;<\/span>\n\nGeneratorFunctionPrototype<\/span>[<\/span>toStringTagSymbol<\/span>]<\/span> =<\/span>\n  GeneratorFunction<\/span>.<\/span>displayName<\/span> =<\/span> \"GeneratorFunction\"<\/span>;<\/span><\/pre>\n<\/div>\n
\u8fd9\u6bb5\u4ee3\u7801\u6784\u5efa\u4e86\u4e00\u5806\u770b\u8d77\u6765\u5f88\u590d\u6742\u7684\u5173\u7cfb\u94fe\uff0c\u5176\u5b9e\u8fd9\u662f\u53c2\u7167\u7740 ES6 \u89c4\u8303<\/a>\u6784\u5efa\u7684\u5173\u7cfb\u94fe:<\/p>\n
\"regenerator\"<\/a><\/p>\n
\u56fe\u4e2d +@@toStringTag:s = 'Generator'<\/code> \u7684\u5c31\u662f Gp\uff0c+@@toStringTag:s = 'GeneratorFunction'<\/code> \u7684\u5c31\u662f GeneratorFunctionPrototype\u3002<\/p>\n
\u6784\u5efa\u5173\u7cfb\u94fe\u7684\u76ee\u7684\u5728\u4e8e\u5224\u65ad\u5173\u7cfb\u7684\u65f6\u5019\u80fd\u591f\u8ddf\u539f\u751f\u7684\u4fdd\u6301\u4e00\u81f4\uff0c\u5c31\u6bd4\u5982\uff1a<\/p>\n
<\/p>\n
function<\/span>*<\/span> f<\/span>(<\/span>)<\/span> {<\/span>}<\/span>\nvar<\/span> g<\/span> =<\/span> f<\/span>(<\/span>)<\/span>;<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>g<\/span>.<\/span>__proto__<\/span> ===<\/span> f<\/span>.<\/span>prototype<\/span>)<\/span>;<\/span> \/\/ true<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>g<\/span>.<\/span>__proto__<\/span>.<\/span>__proto__<\/span> ===<\/span> f<\/span>.<\/span>__proto__<\/span>.<\/span>prototype<\/span>)<\/span>;<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
\u4e3a\u4e86\u7b80\u5316\u8d77\u89c1\uff0c\u6211\u4eec\u53ef\u4ee5\u628a Gp \u5148\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u7a7a\u5bf9\u8c61\uff0c\u4e0d\u8fc7\u6b63\u5982\u4f60\u5728\u4e0a\u56fe\u4e2d\u770b\u5230\u7684\uff0cnext()\u3001 throw()\u3001return() \u51fd\u6570\u90fd\u662f\u6302\u8f7d\u5728 Gp \u5bf9\u8c61\u4e0a\uff0c\u5b9e\u9645\u4e0a\uff0c\u5728\u5b8c\u6574\u7684\u7f16\u8bd1\u4ee3\u7801\u4e2d\uff0c\u786e\u5b9e\u6709\u4e3a Gp \u6dfb\u52a0\u8fd9\u4e09\u4e2a\u51fd\u6570\u7684\u65b9\u6cd5\uff1a<\/p>\n
<\/p>\n
\/\/ 117 \u884c<\/span>\nfunction<\/span> defineIteratorMethods<\/span>(<\/span>prototype<\/span>)<\/span> {<\/span>\n  [<\/span>\"next\"<\/span>,<\/span> \"throw\"<\/span>,<\/span> \"return\"<\/span>]<\/span>.<\/span>forEach<\/span>(<\/span>function<\/span>(<\/span>method<\/span>)<\/span> {<\/span>\n    prototype<\/span>[<\/span>method<\/span>]<\/span> =<\/span> function<\/span>(<\/span>arg<\/span>)<\/span> {<\/span>\n      return<\/span> this<\/span>.<\/span>_invoke<\/span>(<\/span>method<\/span>,<\/span> arg<\/span>)<\/span>;<\/span>\n    }<\/span>;<\/span>\n  }<\/span>)<\/span>;<\/span>\n}<\/span>\n\n\/\/ 406 \u884c<\/span>\ndefineIteratorMethods<\/span>(<\/span>Gp<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u4e3a\u4e86\u7b80\u5355\u8d77\u89c1\uff0c\u6211\u4eec\u5c06\u6574\u4e2a mark \u51fd\u6570\u7b80\u5316\u4e3a\uff1a<\/p>\n
<\/p>\n
runtime<\/span>.<\/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>\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><\/pre>\n<\/div>\n
wrap \u51fd\u6570<\/h2>\n
\u9664\u4e86\u8bbe\u7f6e\u5173\u7cfb\u94fe\u4e4b\u5916\uff0cmark \u51fd\u6570\u7684\u8fd4\u56de\u503c genFun \u8fd8\u4f5c\u4e3a\u4e86 wrap \u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u5165\uff1a<\/p>\n
<\/p>\n
function<\/span> helloWorldGenerator<\/span>(<\/span>)<\/span> {<\/span>\n  return<\/span> regeneratorRuntime<\/span>.<\/span>wrap<\/span>(<\/span>\n    function<\/span> helloWorldGenerator$<\/span>(<\/span>_context<\/span>)<\/span> {<\/span>\n      ...\n    }<\/span>,<\/span>\n    _marked<\/span>,<\/span>\n    this<\/span>\n  )<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u518d\u770b\u4e0b wrap \u51fd\u6570\uff1a<\/p>\n
<\/p>\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  var<\/span> context<\/span> =<\/span> new<\/span> Context<\/span>(<\/span>[<\/span>]<\/span>)<\/span>;<\/span>\n  generator<\/span>.<\/span>_invoke<\/span> =<\/span> makeInvokeMethod<\/span>(<\/span>innerFn<\/span>,<\/span> self<\/span>,<\/span> context<\/span>)<\/span>;<\/span>\n\n  return<\/span> generator<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u6240\u4ee5\u5f53\u6267\u884c var hw = helloWorldGenerator();<\/code> \u7684\u65f6\u5019\uff0c\u5176\u5b9e\u6267\u884c\u7684\u662f wrap \u51fd\u6570\uff0cwrap \u51fd\u6570\u8fd4\u56de\u4e86 generator\uff0cgenerator \u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u539f\u578b\u662f outerFn.prototype<\/code>, outerFn.prototype<\/code> \u5176\u5b9e\u5c31\u662f genFun.prototype<\/code>\uff0c genFun.prototype<\/code> \u662f\u4e00\u4e2a\u7a7a\u5bf9\u8c61\uff0c\u539f\u578b\u4e0a\u6709 next() \u65b9\u6cd5\u3002<\/p>\n
\u6240\u4ee5\u5f53\u4f60\u6267\u884c hw.next()<\/code> \u7684\u65f6\u5019\uff0c\u6267\u884c\u7684\u5176\u5b9e\u662f hw \u539f\u578b\u7684\u539f\u578b\u4e0a\u7684 next \u51fd\u6570\uff0cnext \u51fd\u6570\u6267\u884c\u7684\u53c8\u662f hw \u7684 _invoke \u51fd\u6570\uff1a<\/p>\n
\n
generator<\/span>.<\/span>_invoke<\/span> =<\/span> makeInvokeMethod<\/span>(<\/span>innerFn<\/span>,<\/span> self<\/span>,<\/span> context<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
innerFn \u5c31\u662f wrap \u5305\u88f9\u7684\u90a3\u4e2a\u51fd\u6570\uff0c\u5176\u5b9e\u5c31\u662f helloWordGenerato$ \u51fd\u6570\uff0c\u5450\uff0c\u5c31\u662f\u8fd9\u4e2a\u51fd\u6570\uff1a<\/p>\n
<\/p>\n
function<\/span> helloWorldGenerator$<\/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> \"hello\"<\/span>;<\/span>\n\n      case<\/span> 2<\/span>:\n        _context<\/span>.<\/span>next<\/span> =<\/span> 4<\/span>;<\/span>\n        return<\/span> \"world\"<\/span>;<\/span>\n\n      case<\/span> 4<\/span>:\n        return<\/span> _context<\/span>.<\/span>abrupt<\/span>(<\/span>\"return\"<\/span>,<\/span> \"ending\"<\/span>)<\/span>;<\/span>\n\n      case<\/span> 5<\/span>:\n      case<\/span> \"end\"<\/span>:\n        return<\/span> _context<\/span>.<\/span>stop<\/span>(<\/span>)<\/span>;<\/span>\n    }<\/span>\n  }<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u800c context \u4f60\u53ef\u4ee5\u76f4\u63a5\u7406\u89e3\u4e3a\u8fd9\u6837\u4e00\u4e2a\u5168\u5c40\u5bf9\u8c61\uff1a<\/p>\n
<\/p>\n
var<\/span> ContinueSentinel<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n\nvar<\/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  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><\/pre>\n<\/div>\n
\u6bcf\u6b21 hw.next<\/code> \u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u4fee\u6539 next \u548c prev \u5c5e\u6027\u7684\u503c\uff0c\u5f53\u5728 generator \u51fd\u6570\u4e2d return \u7684\u65f6\u5019\u4f1a\u6267\u884c abrupt\uff0cabrupt \u4e2d\u53c8\u4f1a\u6267\u884c complete\uff0c\u6267\u884c\u5b8c complete\uff0c\u56e0\u4e3a this.next = end<\/code> \u7684\u7f18\u6545\uff0c\u518d\u6267\u884c\u5c31\u4f1a\u6267\u884c stop \u51fd\u6570\u3002<\/p>\n
\u6211\u4eec\u6765\u770b\u4e0b makeInvokeMethod \u51fd\u6570\uff1a<\/p>\n
<\/p>\n
var<\/span> ContinueSentinel<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n\nfunction<\/span> makeInvokeMethod<\/span>(<\/span>innerFn<\/span>,<\/span> self<\/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\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\n      state<\/span> =<\/span> 'executing'<\/span>;<\/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      if<\/span> (<\/span>record<\/span>.<\/span>type<\/span> ===<\/span> \"normal\"<\/span>)<\/span> {<\/span>\n\n        state<\/span> =<\/span> context<\/span>.<\/span>done<\/span>\n          ? 'completed'<\/span>\n          : '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\n      }<\/span>\n    }<\/span>\n  }<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u57fa\u672c\u7684\u6267\u884c\u8fc7\u7a0b\u5c31\u4e0d\u5206\u6790\u4e86\uff0c\u6211\u4eec\u91cd\u70b9\u770b\u7b2c\u4e09\u6b21\u6267\u884c hw.next()<\/code> \u7684\u65f6\u5019:<\/p>\n
\u7b2c\u4e09\u6b21\u6267\u884c hw.next()<\/code> \u7684\u65f6\u5019\uff0c\u5176\u5b9e\u6267\u884c\u4e86<\/p>\n
\n
this<\/span>.<\/span>_invoke<\/span>(<\/span>\"next\"<\/span>,<\/span> undefined<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u5728 invoke \u51fd\u6570\u4e2d\u6784\u5efa\u4e86\u4e00\u4e2a record \u5bf9\u8c61\uff1a<\/p>\n
<\/p>\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><\/pre>\n<\/div>\n
\u800c\u5728 innerFn.call(self, context)<\/code> \u4e2d\uff0c\u56e0\u4e3a _context.next \u4e3a 4 \u7684\u7f18\u6545\uff0c\u5176\u5b9e\u6267\u884c\u4e86:<\/p>\n
\n
_context<\/span>.<\/span>abrupt<\/span>(<\/span>\"return\"<\/span>,<\/span> 'ending'<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u800c\u5728 abrupt \u4e2d\uff0c\u6211\u4eec\u53c8\u6784\u5efa\u4e86\u4e00\u4e2a record \u5bf9\u8c61\uff1a<\/p>\n
<\/p>\n
var<\/span> record<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\nrecord<\/span>.<\/span>type<\/span> =<\/span> 'return'<\/span>;<\/span>\nrecord<\/span>.<\/span>arg<\/span> =<\/span> 'ending'<\/span>;<\/span><\/pre>\n<\/div>\n
\u7136\u540e\u6267\u884c\u4e86 this.complete(record)<\/code>\uff0c<\/p>\n
\u5728 complete \u4e2d\uff0c\u56e0\u4e3a record.type === \"return\"<\/code><\/p>\n
<\/p>\n
this<\/span>.<\/span>rval<\/span> =<\/span> 'ending'<\/span>;<\/span>\nthis<\/span>.<\/span>method<\/span> =<\/span> \"return\"<\/span>;<\/span>\nthis<\/span>.<\/span>next<\/span> =<\/span> \"end\"<\/span>;<\/span><\/pre>\n<\/div>\n
\u7136\u540e\u8fd4\u56de\u4e86\u5168\u5c40\u5bf9\u8c61 ContinueSentinel\uff0c\u5176\u5b9e\u5c31\u662f\u4e00\u4e2a\u5168\u5c40\u7a7a\u5bf9\u8c61\u3002<\/p>\n
\u7136\u540e\u5728 invoke \u51fd\u6570\u4e2d\uff0c\u56e0\u4e3a record.arg === ContinueSentinel<\/code> \u7684\u7f18\u6545\uff0c\u6ca1\u6709\u6267\u884c\u540e\u9762\u7684 return \u8bed\u53e5\uff0c\u5c31\u76f4\u63a5\u8fdb\u5165\u4e0b\u4e00\u4e2a\u5faa\u73af\u3002<\/p>\n
\u4e8e\u662f\u53c8\u6267\u884c\u4e86\u4e00\u904d innerFn.call(self, context)<\/code>\uff0c\u6b64\u65f6 _context.next<\/code> \u4e3a end, \u6267\u884c\u4e86 _context.stop()<\/code>, \u5728 stop \u51fd\u6570\u4e2d\uff1a<\/p>\n
<\/p>\n
this<\/span>.<\/span>done<\/span> =<\/span> true<\/span>;<\/span>\nreturn<\/span> this<\/span>.<\/span>rval<\/span>;<\/span> \/\/ this.rval \u5176\u5b9e\u5c31\u662f `ending`<\/span><\/pre>\n<\/div>\n
\u6240\u4ee5\u6700\u7ec8\u8fd4\u56de\u7684\u503c\u4e3a:<\/p>\n
<\/p>\n
{<\/span>\n  value<\/span>: 'ending'<\/span>,<\/span>\n  done<\/span>: true<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
\u4e4b\u540e\uff0c\u6211\u4eec\u518d\u6267\u884c hw.next() \u7684\u65f6\u5019\uff0c\u56e0\u4e3a state \u5df2\u7ecf\u662f ‘completed’ \u7684\u7f18\u6545\uff0c\u76f4\u63a5\u5c31\u8fd4\u56de { value: undefined, done: true}<\/code><\/p>\n
\u4e0d\u5b8c\u6574\u4f46\u53ef\u7528\u7684\u6e90\u7801<\/h2>\n
\u5f53\u7136\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u770b\u6587\u5b57\u7406\u89e3\u8d77\u6765\u53ef\u80fd\u6709\u4e9b\u96be\u5ea6\uff0c\u4e0d\u5b8c\u6574\u4f46\u53ef\u7528\u7684\u4ee3\u7801\u5982\u4e0b\uff0c\u4f60\u53ef\u4ee5\u65ad\u70b9\u8c03\u8bd5\u67e5\u770b\u5177\u4f53\u7684\u8fc7\u7a0b\uff1a<\/p>\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      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        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\nvar<\/span> _marked<\/span> =<\/span> regeneratorRuntime<\/span>.<\/span>mark<\/span>(<\/span>helloWorldGenerator<\/span>)<\/span>;<\/span>\n\nfunction<\/span> helloWorldGenerator<\/span>(<\/span>)<\/span> {<\/span>\n  return<\/span> regeneratorRuntime<\/span>.<\/span>wrap<\/span>(<\/span>\n    function<\/span> helloWorldGenerator$<\/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> \"hello\"<\/span>;<\/span>\n\n          case<\/span> 2<\/span>:\n            _context<\/span>.<\/span>next<\/span> =<\/span> 4<\/span>;<\/span>\n            return<\/span> \"world\"<\/span>;<\/span>\n\n          case<\/span> 4<\/span>:\n            return<\/span> _context<\/span>.<\/span>abrupt<\/span>(<\/span>\"return\"<\/span>,<\/span> \"ending\"<\/span>)<\/span>;<\/span>\n\n          case<\/span> 5<\/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    _marked<\/span>,<\/span>\n    this<\/span>\n  )<\/span>;<\/span>\n}<\/span>\n\nvar<\/span> hw<\/span> =<\/span> helloWorldGenerator<\/span>(<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>hw<\/span>.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>hw<\/span>.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>hw<\/span>.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>hw<\/span>.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\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\/102<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u524d\u8a00 \u672c\u6587\u5c31\u662f\u7b80\u5355\u4ecb\u7ecd\u4e0b Generator \u8bed\u6cd5\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u3002 Generator function* helloWorldGenerator() { yie…<\/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-1361","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1361"}],"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=1361"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1361\/revisions"}],"predecessor-version":[{"id":1480,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1361\/revisions\/1480"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}