{"id":1889,"date":"2023-03-23T06:15:45","date_gmt":"2023-03-22T22:15:45","guid":{"rendered":"https:\/\/zhuxinyong.com\/?p=1889"},"modified":"2023-04-18T06:26:13","modified_gmt":"2023-04-17T22:26:13","slug":"javascript-ke-shi-huagenerators-and-iterators","status":"publish","type":"post","link":"https:\/\/zhuxinyong.com\/?p=1889","title":{"rendered":"JavaScript \u53ef\u89c6\u5316\uff1aGenerators and Iterators"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/16795233969445.jpg\" alt=\"\" \/><\/p>\n<p>\u539f\u6587\u5730\u5740\uff1a<a href=\"https:\/\/dev.to\/lydiahallie\/javascript-visualized-generators-and-iterators-e36\" target=\"_blank\" rel=\"noopener\">https:\/\/dev.to\/lydiahallie\/javascript-visualized-generators-and-iterators-e36<\/a><\/p>\n<p>ES6\u5f15\u5165\u4e86\u4e00\u4e2a\u5f88\u9177\u7684\u4e1c\u897f\uff0c\u53eb\u505a\u751f\u6210\u5668\u51fd\u6570 \ud83c\udf89\uff0c\u6bcf\u5f53\u6211\u95ee\u522b\u4eba\u5173\u4e8e\u751f\u6210\u5668\u51fd\u6570\u7684\u95ee\u9898\uff0c\u56de\u7b54\u57fa\u672c\u4e0a\u90fd\u662f\uff1a &quot;\u6211\u770b\u8fc7\u4e00\u6b21\uff0c\u5f88\u56f0\u60d1\uff0c\u5c31\u6ca1\u518d\u770b\u4e86&quot;\uff0c&quot;\u54e6\uff0c\u5929\u54ea\uff0c\u6211\u8bfb\u8fc7\u5f88\u591a\u5173\u4e8e\u751f\u6210\u5668\u51fd\u6570\u7684\u535a\u5ba2\u6587\u7ae0\uff0c\u4f46\u6211\u8fd8\u662f\u4e0d\u660e\u767d&quot;\uff0c&quot;\u6211\u660e\u767d\u4e86\uff0c\u4f46\u4e3a\u4ec0\u4e48\u6709\u4eba\u4f1a\u7528\u8fd9\u4e2a&quot;\ud83e\udd14\u6216\u8005\u8fd9\u53ea\u662f\u6211\u548c\u81ea\u5df1\u7684\u5bf9\u8bdd\uff0c\u56e0\u4e3a\u6211\u8fc7\u53bb\u5f88\u957f\u4e00\u6bb5\u65f6\u95f4\u90fd\u662f\u8fd9\u4e48\u60f3\u7684\uff01&quot;\uff01\u4f46\u5b83\u4eec\u5b9e\u9645\u4e0a\u662f\u76f8\u5f53\u9177\u7684\u3002<\/p>\n<p>\u90a3\u4e48\uff0c\u4ec0\u4e48\u662f\u751f\u6210\u5668\u51fd\u6570\uff1f\u8ba9\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e2a\u5e38\u89c4\u7684\u8001\u5f0f\u51fd\u6570 \ud83d\udc75\ud83c\udffc<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/16795747858719.jpg\" alt=\"\" \/><\/p>\n<p>\u662f\u7684\uff0c\u8fd9\u7edd\u5bf9\u6ca1\u4ec0\u4e48\u7279\u522b\u7684\uff01\u8fd9\u53ea\u662f\u4e00\u4e2a\u6253\u5370 4 \u6b21\u503c\u7684\u666e\u901a\u51fd\u6570\u3002\u6211\u4eec\u6765\u8c03\u7528\u4e00\u4e0b\u5b83\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/111.webp\" alt=\"111\" \/><\/p>\n<p>\u201c\u4f46\u662f\uff0cLydia\uff0c\u4e3a\u4ec0\u4e48\u4f60\u6d6a\u8d39\u4e86\u62115\u79d2\u949f\u7684\u65f6\u95f4\uff0c\u53ea\u662f\u770b\u8fd9\u4e2a\u666e\u901a\u65e0\u804a\u7684\u51fd\u6570\uff1f\u201d\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u95ee\u9898\u3002\u666e\u901a\u51fd\u6570\u9075\u5faa\u4e00\u79cd\u79f0\u4e3a\u201c\u8fd0\u884c\u81f3\u5b8c\u6210\u6a21\u578b\u201d\u7684\u6a21\u578b\uff1a\u5f53\u6211\u4eec\u8c03\u7528\u4e00\u4e2a\u51fd\u6570\u65f6\uff0c\u5b83\u5c06\u4e00\u76f4\u8fd0\u884c\u76f4\u5230\u5b8c\u6210\uff08\u597d\u5427\uff0c\u9664\u975e\u5728\u67d0\u5904\u53d1\u751f\u9519\u8bef\uff09\u3002\u6211\u4eec\u4e0d\u80fd\u968f\u610f\u5728\u51fd\u6570\u4e2d\u95f4\u7684\u4efb\u4f55\u4f4d\u7f6e\u6682\u505c\u51fd\u6570\u3002<\/p>\n<p>\u73b0\u5728\u6700\u9177\u7684\u90e8\u5206\u6765\u4e86\uff1a\u751f\u6210\u5668\u51fd\u6570\u4e0d\u9075\u5faa\u8fd0\u884c\u5230\u5b8c\u6210\u6a21\u578b\uff01 \ud83e\udd2f \u8fd9\u662f\u5426\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u5728\u751f\u6210\u5668\u51fd\u6570\u6267\u884c\u8fc7\u7a0b\u4e2d\u968f\u673a\u6682\u505c\u5b83\uff1f\u597d\u5427\uff0c\u6709\u70b9\uff01\u8ba9\u6211\u4eec\u6765\u770b\u770b\u751f\u6210\u5668\u51fd\u6570\u662f\u4ec0\u4e48\u4ee5\u53ca\u6211\u4eec\u5982\u4f55\u4f7f\u7528\u5b83\u4eec\u3002<\/p>\n<p>\u6211\u4eec\u901a\u8fc7\u5728 function \u5173\u952e\u5b57\u540e\u5199\u4e00\u4e2a\u661f\u53f7 * \u6765\u521b\u5efa\u4e00\u4e2a\u751f\u6210\u5668\u51fd\u6570\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/16795753285055.jpg\" alt=\"\" \/><\/p>\n<p>\u4f46\u8fd9\u5e76\u4e0d\u662f\u6211\u4eec\u4f7f\u7528\u751f\u6210\u5668\u51fd\u6570\u6240\u8981\u505a\u7684\u5168\u90e8\uff01\u4e0e\u5e38\u89c4\u51fd\u6570\u76f8\u6bd4\uff0c\u751f\u6210\u5668\u51fd\u6570\u5b9e\u9645\u4e0a\u4ee5\u5b8c\u5168\u4e0d\u540c\u7684\u65b9\u5f0f\u5de5\u4f5c\uff1a<\/p>\n<ul>\n<li>\u8c03\u7528\u751f\u6210\u5668\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u751f\u6210\u5668\u5bf9\u8c61\uff0c\u5b83\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\u3002<\/li>\n<li>\u6211\u4eec\u53ef\u4ee5\u5728\u751f\u6210\u5668\u51fd\u6570\u4e2d\u4f7f\u7528 yield \u5173\u952e\u5b57\u6765\u201c\u6682\u505c\u201d\u6267\u884c\u3002<\/li>\n<\/ul>\n<p>\u4f46\u8fd9\u5230\u5e95\u662f\u4ec0\u4e48\u610f\u601d\uff01\uff1f<\/p>\n<p>\u8ba9\u6211\u4eec\u5148\u56de\u987e\u4e00\u4e0b\u7b2c\u4e00\u4e2a\uff1a\u8c03\u7528\u751f\u6210\u5668\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u751f\u6210\u5668\u5bf9\u8c61\u3002\u5f53\u6211\u4eec\u8c03\u7528\u4e00\u4e2a\u5e38\u89c4\u51fd\u6570\u65f6\uff0c\u51fd\u6570\u4f53\u88ab\u6267\u884c\u5e76\u6700\u7ec8\u8fd4\u56de\u4e00\u4e2a\u503c\u3002\u7136\u800c\uff0c\u5f53\u6211\u4eec\u8c03\u7528\u751f\u6210\u5668\u51fd\u6570\u65f6\uff0c\u4f1a\u8fd4\u56de\u4e00\u4e2a\u751f\u6210\u5668\u5bf9\u8c61\uff01\u8ba9\u6211\u4eec\u6253\u5370\u4e00\u4e0b\u8fd4\u56de\u503c\u7684\u6837\u5b50\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/lyuivuuepy1hzpok8rc5.webp\" alt=\"lyuivuuepy1hzpok8rc5\" \/><\/p>\n<p>\u73b0\u5728\uff0c\u6211\u53ef\u4ee5\u542c\u5230\u4f60\u5185\u5fc3\uff08\u6216\u5916\u90e8 \ud83d\ude43\uff09\u7684\u5c16\u53eb\uff0c\u56e0\u4e3a\u8fd9\u770b\u8d77\u6765\u6709\u70b9\u4ee4\u4eba\u4e0d\u77e5\u6240\u63aa\u3002\u4f46\u522b\u62c5\u5fc3\uff0c\u6211\u4eec\u771f\u7684\u4e0d\u5fc5\u4f7f\u7528\u60a8\u5728\u6b64\u5904\u770b\u5230\u7684\u4efb\u4f55\u8bb0\u5f55\u7684\u5c5e\u6027\u3002\u90a3\u4e48\u751f\u6210\u5668\u5bf9\u8c61\u6709\u4ec0\u4e48\u7528\u5462\uff1f<\/p>\n<p>\u9996\u5148\u6211\u4eec\u9700\u8981\u9000\u4e00\u6b65\uff0c\u56de\u7b54\u5e38\u89c4\u51fd\u6570\u548c\u751f\u6210\u5668\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u533a\u522b\uff1a\u6211\u4eec\u53ef\u4ee5\u5728\u751f\u6210\u5668\u51fd\u6570\u4e2d\u4f7f\u7528 yield \u5173\u952e\u5b57\u6765\u201c\u6682\u505c\u201d\u6267\u884c\u3002<\/p>\n<p>\u4f7f\u7528\u751f\u6210\u5668\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u5199\uff08 genFunc \u662f generatorFunction \u7684\u7f29\u5199\uff09\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/16797644542491.jpg\" alt=\"\" \/><\/p>\n<p>\u90a3\u4e2a <code>yield<\/code> \u5173\u952e\u5b57\u5728\u505a\u4ec0\u4e48\uff1f\u751f\u6210\u5668\u7684\u6267\u884c\u5728\u9047\u5230 <code>yield<\/code> \u5173\u952e\u5b57\u65f6\u201c\u6682\u505c\u201d\u3002\u6700\u597d\u7684\u4e8b\u60c5\u662f\uff0c\u4e0b\u6b21\u8fd0\u884c\u51fd\u6570\u65f6\uff0c\u5b83\u8bb0\u4f4f\u4e86\u4e4b\u524d\u6682\u505c\u7684\u4f4d\u7f6e\uff0c\u5e76\u4ece\u90a3\u91cc\u7ee7\u7eed\u8fd0\u884c\uff01\ud83d\ude03\u8fd9\u57fa\u672c\u4e0a\u5c31\u662f\u8fd9\u91cc\u53d1\u751f\u7684\u4e8b\u60c5\uff08\u4e0d\u7528\u62c5\u5fc3\uff0c\u7a0d\u540e\u4f1a\u8fdb\u884c\u52a8\u753b\u6f14\u793a\uff09\uff1a<\/p>\n<ol>\n<li>\u7b2c\u4e00\u6b21\u8fd0\u884c\u65f6\uff0c\u5b83\u5728\u7b2c\u4e00\u884c &quot;\u6682\u505c&quot; \u5e76\u4ea7\u751f\u5b57\u7b26\u4e32\u503c &quot;\u2728&quot;\u3002<\/li>\n<li>\u7b2c\u4e8c\u6b21\u8fd0\u884c\u65f6\uff0c\u5b83\u4ece\u4e0a\u4e00\u4e2a yield \u5173\u952e\u5b57\u7684\u884c\u5f00\u59cb\u3002\u7136\u540e\u4e00\u76f4\u8fd0\u884c\u5230\u7b2c\u4e8c\u4e2a yield \u5173\u952e\u5b57\uff0c\u5e76\u4ea7\u751f\u503c&#8217;\ud83d\udc95&#8217;\u3002<\/li>\n<li>\u7b2c\u4e09\u6b21\u8fd0\u884c\u65f6\uff0c\u5b83\u4ece\u4e0a\u4e00\u4e2a yield \u5173\u952e\u5b57\u7684\u90a3\u4e00\u884c\u5f00\u59cb\u3002\u5b83\u4e00\u76f4\u5411\u4e0b\u8fd0\u884c\uff0c\u76f4\u5230\u9047\u5230 return \u5173\u952e\u5b57\uff0c\u5e76\u8fd4\u56de\u503c&#8217;\u5b8c\u6210\uff01&#8217;\u3002<\/li>\n<\/ol>\n<p>\u4f46\u662f&#8230;\u5982\u679c\u6211\u4eec\u4e4b\u524d\u770b\u5230\u8c03\u7528\u751f\u6210\u5668\u51fd\u6570\u8fd4\u56de\u4e86\u4e00\u4e2a\u751f\u6210\u5668\u5bf9\u8c61\uff0c\u6211\u4eec\u8be5\u5982\u4f55\u8c03\u7528\u8be5\u51fd\u6570\u5462\uff1f\ud83e\udd14 \u8fd9\u5c31\u662f\u751f\u6210\u5668\u5bf9\u8c61\u53d1\u6325\u4f5c\u7528\u7684\u5730\u65b9\uff01<\/p>\n<p>\u751f\u6210\u5668\u5bf9\u8c61\u5305\u542b\u4e00\u4e2aNext\u65b9\u6cd5\uff08\u5728\u539f\u578b\u94fe\u4e0a\uff09\u3002\u8fd9\u4e2a\u65b9\u6cd5\u662f\u6211\u4eec\u7528\u6765\u8fed\u4ee3\u751f\u6210\u5668\u5bf9\u8c61\u7684\u3002\u7136\u800c\uff0c\u4e3a\u4e86\u5728\u4ea7\u751f\u4e00\u4e2a\u503c\u540e\u8bb0\u4f4f\u5b83\u4e4b\u524d\u6240\u5904\u7684\u72b6\u6001\uff0c\u6211\u4eec\u9700\u8981\u5c06\u751f\u6210\u5668\u5bf9\u8c61\u5206\u914d\u7ed9\u4e00\u4e2a\u53d8\u91cf\u3002\u6211\u628a\u5b83\u53eb\u505agenObj\uff0c\u662fgeneratorObject\u7684\u7f29\u5199\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/1.gif\" alt=\"1\" \/><\/p>\n<p>\u662f\u7684\uff0c\u5c31\u662f\u6211\u4eec\u4e4b\u524d\u770b\u5230\u7684\u90a3\u4e2a\u770b\u8d77\u6765\u53ef\u6015\u7684\u4e1c\u897f\u3002\u8ba9\u6211\u4eec\u770b\u770b\u5728genObj\u751f\u6210\u5668\u5bf9\u8c61\u4e0a\u8c03\u7528 next \u65b9\u6cd5\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/2.gif\" alt=\"2\" \/><\/p>\n<p>\u751f\u6210\u5668\u4e00\u76f4\u8fd0\u884c\u5230\u9047\u5230\u7b2c\u4e00\u4e2a yield \u5173\u952e\u5b57\uff0c\u800c\u8fd9\u4e2a\u5173\u952e\u5b57\u6070\u597d\u5728\u7b2c\u4e00\u884c\uff01\u5b83\u4ea7\u751f\u4e86\u4e00\u4e2a\u5305\u542b <code>value<\/code> \u5c5e\u6027\u548c\u4e00\u4e2a <code>done<\/code> \u5c5e\u6027\u7684\u5bf9\u8c61\u3002<\/p>\n<pre><code class=\"language-plain_text\">{ value: ... , done: ... }\n<\/code><\/pre>\n<p>&quot;value&quot; \u5c5e\u6027\u7b49\u4e8e\u6211\u4eec\u751f\u6210\u7684\u503c\u3002&quot;done&quot; \u5c5e\u6027\u662f\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u53ea\u6709\u5f53\u751f\u6210\u5668\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u503c\uff08\u800c\u4e0d\u662f\u751f\u6210\u503c\uff01\ud83d\ude0a\uff09\u65f6\u624d\u8bbe\u7f6e\u4e3a true\u3002<\/p>\n<p>\u6211\u4eec\u505c\u6b62\u4e86\u5bf9\u751f\u6210\u5668\u7684\u8fed\u4ee3\uff0c\u8fd9\u4f7f\u5f97\u51fd\u6570\u770b\u8d77\u6765\u5c31\u50cf\u6682\u505c\u4e86\u4e00\u6837\uff01\u8fd9\u662f\u591a\u4e48\u9177\u554a\u3002\u8ba9\u6211\u4eec\u518d\u6b21\u8c03\u7528next\u65b9\u6cd5\uff01\ud83d\ude03<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/1-1.gif\" alt=\"1\" \/><\/p>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u5c06\u5b57\u7b26\u4e32\u201cFirst log\uff01\u201d\u8bb0\u5f55\u5230\u63a7\u5236\u53f0\u4e2d\u3002\u8fd9\u65e2\u4e0d\u662f yield \u5173\u952e\u5b57\u4e5f\u4e0d\u662f return \u5173\u952e\u5b57\uff0c\u56e0\u6b64\u5b83\u7ee7\u7eed\u6267\u884c\uff01\u7136\u540e\uff0c\u5b83\u9047\u5230\u4e86\u4e00\u4e2a\u5e26\u6709\u503c\u201c\ud83d\udc95\u201d\u7684 yield \u5173\u952e\u5b57\u3002\u4e00\u4e2a\u5bf9\u8c61\u88ab yield\uff0c\u5176\u503c\u5c5e\u6027\u4e3a\u201c\ud83d\udc95\u201d\uff0c\u5e76\u5e26\u6709\u4e00\u4e2a done \u5c5e\u6027\u3002done \u5c5e\u6027\u7684\u503c\u4e3a false\uff0c\u56e0\u4e3a\u6211\u4eec\u8fd8\u6ca1\u6709\u4ece\u751f\u6210\u5668\u4e2d\u8fd4\u56de\u3002<\/p>\n<p>\u6211\u4eec\u5feb\u5230\u4e86!\u8ba9\u6211\u4eec\u6700\u540e\u4e00\u6b21\u8c03\u7528\u4e0b\u4e00\u4e2a\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/2-1.gif\" alt=\"2\" \/><\/p>\n<p>\u6211\u4eec\u5c06\u5b57\u7b26\u4e32 Second log! \u8bb0\u5f55\u5230\u63a7\u5236\u53f0\u3002\u7136\u540e\uff0c\u5b83\u9047\u5230\u4e86\u503c\u4e3a &#8216;Done!&#8217; \u7684 return \u5173\u952e\u5b57\u3002\u8fd4\u56de\u7684\u5bf9\u8c61\u5177\u6709 &#8216;Done!&#8217; \u7684 value \u5c5e\u6027\u3002\u6211\u4eec\u8fd9\u6b21\u5b9e\u9645\u4e0a\u8fd4\u56de\u4e86\uff0c\u6240\u4ee5 done \u7684\u503c\u8bbe\u7f6e\u4e3a true \uff01<\/p>\n<p>done \u5c5e\u6027\u5b9e\u9645\u4e0a\u975e\u5e38\u91cd\u8981\u3002\u6211\u4eec\u53ea\u80fd\u8fed\u4ee3\u4e00\u6b21\u751f\u6210\u5668\u5bf9\u8c61\u3002\u4ec0\u4e48\uff1f\uff01\u90a3\u4e48\uff0c\u5f53\u6211\u4eec\u518d\u6b21\u8c03\u7528 next \u65b9\u6cd5\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\uff1f<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/1-2.gif\" alt=\"1\" \/><\/p>\n<p>\u5b83\u53ea\u662f\u6c38\u8fdc\u8fd4\u56de undefined \u3002\u5982\u679c\u4f60\u60f3\u518d\u6b21\u8fed\u4ee3\u5b83\uff0c\u4f60\u53ea\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u751f\u6210\u5668\u5bf9\u8c61\uff01<\/p>\n<p>\u6b63\u5982\u6211\u4eec\u521a\u521a\u770b\u5230\u7684\uff0c\u751f\u6210\u5668\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5668\uff08\u751f\u6210\u5668\u5bf9\u8c61\uff09\u3002\u4f46\u3002\u3002\u7b49\u5f85\u8fed\u4ee3\u5668\uff1f\u8fd9\u662f\u5426\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u5728\u8fd4\u56de\u7684\u5bf9\u8c61\u4e0a\u4f7f\u7528 for of \u5faa\u73af\u548c\u6269\u5c55\u8fd0\u7b97\u7b26\uff1f\u4e9a\u65af\uff01\ud83e\udd29<\/p>\n<p>\u8ba9\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528 [&#8230; ] \u8bed\u6cd5\u5c06\u751f\u6210\u7684\u503c\u5206\u6563\u5230\u6570\u7ec4\u4e2d\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/2-2.gif\" alt=\"2\" \/><\/p>\n<p>\u6216\u8005\u4e5f\u8bb8\u901a\u8fc7\u4f7f\u7528 for of \u5faa\u73af\uff1f\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/3.gif\" alt=\"3\" \/><\/p>\n<p>\u4f46\u662f\u662f\u4ec0\u4e48\u8ba9\u8fed\u4ee3\u5668\u6210\u4e3a\u8fed\u4ee3\u5668\u5462\uff1f\u56e0\u4e3a\u6211\u4eec\u8fd8\u53ef\u4ee5\u5c06 for-of \u5faa\u73af\u548c\u6269\u5c55\u8bed\u6cd5\u4e0e\u6570\u7ec4\u3001\u5b57\u7b26\u4e32\u3001\u6620\u5c04\u548c\u96c6\u5408\u4e00\u8d77\u4f7f\u7528\u3002\u8fd9\u5b9e\u9645\u4e0a\u662f\u56e0\u4e3a\u4ed6\u4eec\u5b9e\u73b0\u4e86\u8fed\u4ee3\u5668\u534f\u8bae\uff1a [Symbol.iterator] \u3002\u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b\u503c\uff08\u5177\u6709\u975e\u5e38\u63cf\u8ff0\u6027\u7684\u540d\u79f0\uff0c\u54c8\u54c8\ud83d\udc81\ud83c\udffc \u2640\ufe0f\uff09\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/4.png\" alt=\"4\" \/><br \/>\narray \u3001 string \u548c generatorObject \u90fd\u662f\u8fed\u4ee3\u5668\uff01\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u4ed6\u4eec\u7684 [Symbol.iterator] \u5c5e\u6027\u7684\u503c\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/5.gif\" alt=\"5\" \/><\/p>\n<p>\u4f46\u662f\uff0c\u4e0d\u53ef\u8fed\u4ee3\u7684\u503c\u4e0a\u7684 [Symbol.iterator] \u503c\u662f\u591a\u5c11\uff1f<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/6.gif\" alt=\"6\" \/><\/p>\n<p>\u662f\u7684\uff0c\u5b83\u53ea\u662f\u4e0d\u5b58\u5728\u3002\u6240\u4ee5\u3002\u3002\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u5730\u624b\u52a8\u6dfb\u52a0 [Symbol.iterator] \u5c5e\u6027\uff0c\u5e76\u4f7f\u4e0d\u53ef\u8fed\u4ee3\u5bf9\u8c61\u53ef\u8fed\u4ee3\u5417\uff1f\u662f\u7684\uff0c\u6211\u4eec\u80fd\uff01\ud83d\ude03<\/p>\n<p>[Symbol.iterator] \u5fc5\u987b\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2a next \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5c31\u50cf\u6211\u4eec\u4e4b\u524d\u770b\u5230\u7684\u90a3\u6837\uff1a { value: &#8216;&#8230;&#8217;, done: false\/true } \u3002<\/p>\n<p>\u4e3a\u4e86\u4fdd\u6301\u7b80\u5355\uff08\u5c31\u50cf\u61d2\u60f0\u7684\u6211\u559c\u6b22\u505a\u7684\u90a3\u6837\uff09\uff0c\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u5730\u5c06 [Symbol.iterator] \u7684\u503c\u8bbe\u7f6e\u4e3a\u7b49\u4e8e\u751f\u6210\u5668\u51fd\u6570\uff0c\u56e0\u4e3a\u8fd9\u9ed8\u8ba4\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5668\u3002\u8ba9\u6211\u4eec\u4f7f\u5bf9\u8c61\u6210\u4e3a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0c\u5e76\u5c06\u751f\u6210\u7684\u503c\u8bbe\u7f6e\u4e3a\u6574\u4e2a\u5bf9\u8c61\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/16817698113020.jpg\" alt=\"\" \/><\/p>\n<p>\u770b\u770b\u73b0\u5728\u6211\u4eec\u5728 object \u5bf9\u8c61\u4e0a\u4f7f\u7528 spread \u8bed\u6cd5\u6216 for-of \u5faa\u73af\u4f1a\u53d1\u751f\u4ec0\u4e48\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/7.gif\" alt=\"7\" \/><\/p>\n<p>\u6216\u8005\uff0c\u4e5f\u8bb8\u6211\u4eec\u53ea\u60f3\u83b7\u53d6\u5bf9\u8c61\u952e\u3002\u201c\u54e6\uff0c\u8fd9\u5f88\u5bb9\u6613\uff0c\u6211\u4eec\u53ea\u4ea7\u751f Object.keys(this) \u800c\u4e0d\u662f this \u201d\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/16817698459628.jpg\" alt=\"\" \/><\/p>\n<p>\u55ef\uff0c\u8ba9\u6211\u4eec\u8bd5\u8bd5\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/8.gif\" alt=\"8\" \/><\/p>\n<p>\u54e6\uff0c\u5c04\u51fb\u3002 Object.keys(this) \u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u56e0\u6b64\u751f\u6210\u7684\u503c\u662f\u4e00\u4e2a\u6570\u7ec4\u3002\u7136\u540e\u6211\u4eec\u5c06\u8fd9\u4e2a\u751f\u6210\u7684\u6570\u7ec4\u5206\u6563\u5230\u53e6\u4e00\u4e2a\u6570\u7ec4\u4e2d\uff0c\u4ece\u800c\u5f97\u5230\u4e00\u4e2a\u5d4c\u5957\u6570\u7ec4\u3002\u6211\u4eec\u4e0d\u60f3\u8981\u8fd9\u4e2a\uff0c\u6211\u4eec\u53ea\u662f\u60f3\u4ea4\u51fa\u6bcf\u4e2a\u5355\u72ec\u7684\u5bc6\u94a5\uff01<\/p>\n<p>\u597d\u6d88\u606f\uff01\ud83e\udd73 \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 yield* \u5173\u952e\u5b57\u4ece\u751f\u6210\u5668\u4e2d\u7684\u8fed\u4ee3\u5668\u4e2d\u751f\u6210\u5355\u4e2a\u503c\uff0c\u56e0\u6b64\u5e26\u6709\u661f\u53f7\u7684 yield \uff01\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u751f\u6210\u5668\u51fd\u6570\uff0c\u5b83\u9996\u5148\u4ea7\u751f\u4e00\u4e2a\u9cc4\u68a8\uff0c\u7136\u540e\u6211\u4eec\u60f3\u5355\u72ec\u4ea7\u751f\u53e6\u4e00\u4e2a\u8fed\u4ee3\u5668\uff08\u5728\u672c\u4f8b\u4e2d\u4e3a\u6570\u7ec4\uff09\u7684\u503c\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 yield* \u5173\u952e\u5b57\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u7136\u540e\u6211\u4eec\u59d4\u6258\u7ed9\u53e6\u4e00\u4e2a\u751f\u6210\u5668\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/9.gif\" alt=\"9\" \/><\/p>\n<p>\u59d4\u6258\u751f\u6210\u5668\u7684\u6bcf\u4e2a\u503c\u90fd\u4f1a\u5728\u7ee7\u7eed\u8fed\u4ee3 genObj \u8fed\u4ee3\u5668\u4e4b\u524d\u751f\u6210\u3002<\/p>\n<p>\u8fd9\u6b63\u662f\u6211\u4eec\u9700\u8981\u505a\u7684\uff0c\u4ee5\u4fbf\u5355\u72ec\u83b7\u53d6\u6240\u6709\u5bf9\u8c61\u952e\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/10.gif\" alt=\"10\" \/><\/p>\n<p>\u751f\u6210\u5668\u51fd\u6570\u7684\u53e6\u4e00\u4e2a\u7528\u9014\u662f\uff0c\u6211\u4eec\u53ef\u4ee5\uff08\u67d0\u79cd\u7a0b\u5ea6\u4e0a\uff09\u5c06\u5b83\u4eec\u7528\u4f5c\u89c2\u5bdf\u5668\u51fd\u6570\u3002\u751f\u6210\u5668\u53ef\u4ee5\u7b49\u5f85\u4f20\u5165\u7684\u6570\u636e\uff0c\u5e76\u4e14\u53ea\u6709\u5f53\u8be5\u6570\u636e\u88ab\u4f20\u9012\u65f6\uff0c\u5b83\u624d\u4f1a\u5904\u7406\u5b83\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/16817699440248.jpg\" alt=\"\" \/><\/p>\n<p>\u8fd9\u91cc\u4e00\u4e2a\u5f88\u5927\u7684\u533a\u522b\u662f\uff0c\u6211\u4eec\u4e0d\u53ea\u662f\u50cf\u524d\u9762\u7684\u4f8b\u5b50\u4e2d\u770b\u5230\u7684\u90a3\u6837\u6709 yield [value] \u3002\u76f8\u53cd\uff0c\u6211\u4eec\u5206\u914d\u4e00\u4e2a\u540d\u4e3a second \u7684\u503c\uff0c\u5e76\u751f\u6210\u5b57\u7b26\u4e32 First! \u7684\u503c\u3002\u8fd9\u662f\u6211\u4eec\u7b2c\u4e00\u6b21\u8c03\u7528 next \u65b9\u6cd5\u65f6\u5c06\u751f\u6210\u7684\u503c\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u770b\u770b\u5f53\u6211\u4eec\u7b2c\u4e00\u6b21\u5728\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e0a\u8c03\u7528 next \u65b9\u6cd5\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/11.gif\" alt=\"11\" \/><\/p>\n<p>\u5b83\u5728\u7b2c\u4e00\u884c\u9047\u5230 yield \uff0c\u5e76\u751f\u6210\u503c First! \u3002\u90a3\u4e48\uff0c\u53d8\u91cf second \u7684\u503c\u662f\u591a\u5c11\uff1f<\/p>\n<p>\u8fd9\u5b9e\u9645\u4e0a\u662f\u6211\u4eec\u4e0b\u6b21\u8c03\u7528\u65f6\u4f20\u9012\u7ed9 next \u65b9\u6cd5\u7684\u503c\uff01\u8fd9\u6b21\uff0c\u8ba9\u6211\u4eec\u4f20\u9012\u5b57\u7b26\u4e32 &#8216;I like JavaScript&#8217; \u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2023\/04\/13.gif\" alt=\"13\" \/><\/p>\n<p>\u8bf7\u52a1\u5fc5\u5728\u6b64\u5904\u770b\u5230\uff0c next \u65b9\u6cd5\u7684\u7b2c\u4e00\u6b21\u8c03\u7528\u5c1a\u672a\u8ddf\u8e2a\u4efb\u4f55\u8f93\u5165\u3002\u6211\u4eec\u53ea\u9700\u901a\u8fc7\u7b2c\u4e00\u6b21\u8c03\u7528\u89c2\u5bdf\u5668\u6765\u542f\u52a8\u5b83\u3002\u751f\u6210\u5668\u5728\u7ee7\u7eed\u4e4b\u524d\u7b49\u5f85\u6211\u4eec\u7684\u8f93\u5165\uff0c\u5e76\u53ef\u80fd\u5904\u7406\u6211\u4eec\u4f20\u9012\u7ed9 next \u65b9\u6cd5\u7684\u503c\u3002<\/p>\n<p>\u90a3\u4e48\uff0c\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u751f\u6210\u5668\u51fd\u6570\u5462\uff1f<\/p>\n<p>\u751f\u6210\u5668\u7684\u6700\u5927\u4f18\u70b9\u4e4b\u4e00\u662f\u5b83\u4eec\u662f\u61d2\u60f0\u8bc4\u4f30\u7684\u3002\u8fd9\u610f\u5473\u7740\u8c03\u7528 next 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