{"id":31884,"date":"2022-12-10T19:45:52","date_gmt":"2023-10-01T15:25:06","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8promise%e5%ae%9e%e7%8e%b0node-js%e6%a0%87%e5%87%86%e8%be%93%e5%85%a5%e8%af%bb%e5%8f%96%e3%80%82\/"},"modified":"2024-01-15T06:59:22","modified_gmt":"2024-01-14T22:59:22","slug":"%e4%bd%bf%e7%94%a8promise%e5%ae%9e%e7%8e%b0node-js%e6%a0%87%e5%87%86%e8%be%93%e5%85%a5%e8%af%bb%e5%8f%96%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8promise%e5%ae%9e%e7%8e%b0node-js%e6%a0%87%e5%87%86%e8%be%93%e5%85%a5%e8%af%bb%e5%8f%96%e3%80%82\/","title":{"rendered":"\u4f7f\u7528Promise\u5b9e\u73b0Node.js\u6807\u51c6\u8f93\u5165\u8bfb\u53d6"},"content":{"rendered":"<p>\u5728Node.js\u4e2d\uff0c\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u53d6\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u5982\u4f7f\u7528fs\u6a21\u5757\u7684readFileSync\u51fd\u6570\u4ece\/dev\/stdin\u8bfb\u53d6\uff0c\u6216\u4f7f\u7528readline\u6a21\u5757\u8fdb\u884c\u8bfb\u53d6\u7b49\u3002<\/p>\n<p>\u6211\u8bd5\u8fc7\u4f7f\u7528Promise\u5904\u7406process.stdin\u7684\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">function<\/span> <span class=\"nx\">read<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"k\">new<\/span> <span class=\"nb\">Promise<\/span><span class=\"p\">((<\/span><span class=\"nx\">resolve<\/span><span class=\"p\">,<\/span> <span class=\"nx\">reject<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"kd\">let<\/span> <span class=\"nx\">buffer<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">''<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"nx\">process<\/span><span class=\"p\">.<\/span><span class=\"nx\">stdin<\/span>\r\n            <span class=\"p\">.<\/span><span class=\"nx\">resume<\/span><span class=\"p\">()<\/span>\r\n            <span class=\"p\">.<\/span><span class=\"nx\">setEncoding<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">utf8<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n            <span class=\"p\">.<\/span><span class=\"nx\">on<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">readable<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"k\">while<\/span> <span class=\"p\">((<\/span><span class=\"nx\">chunk<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">process<\/span><span class=\"p\">.<\/span><span class=\"nx\">stdin<\/span><span class=\"p\">.<\/span><span class=\"nx\">read<\/span><span class=\"p\">())<\/span> <span class=\"o\">!==<\/span> <span class=\"kc\">null<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n                    <span class=\"nx\">buffer<\/span> <span class=\"o\">+=<\/span> <span class=\"nx\">chunk<\/span><span class=\"p\">;<\/span>\r\n                <span class=\"p\">}<\/span>\r\n            <span class=\"p\">})<\/span>\r\n            <span class=\"p\">.<\/span><span class=\"nx\">on<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">end<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">resolve<\/span><span class=\"p\">(<\/span><span class=\"nx\">buffer<\/span><span class=\"p\">));<\/span>\r\n    <span class=\"p\">});<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4f7f\u7528\u65f6\uff0c\u8bf7\u4f7f\u7528 async await \uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">function<\/span> <span class=\"nx\">doSomething<\/span><span class=\"p\">(<\/span><span class=\"nx\">input<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">input<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"p\">(<\/span><span class=\"k\">async<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">input<\/span> <span class=\"o\">=<\/span> <span class=\"k\">await<\/span> <span class=\"nx\">read<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"nx\">doSomething<\/span><span class=\"p\">(<\/span><span class=\"nx\">input<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">})();<\/span>\r\n<\/code><\/pre>\n<p>\u56de\u62e8\u7535\u8bdd\u53ef\u80fd\u6bd4\u60f3\u8c61\u4e2d\u597d\u4e00\u4e9b\u5427\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u751f\u6210\u5668\u9010\u884c\u8fd4\u56de\uff0c\u800c\u4e0d\u662f\u5c06\u6570\u636e\u5168\u90e8\u52a0\u8f7d\u5230\u7f13\u51b2\u533a\u4e2d\uff0c\u90a3\u6837\u4f1a\u66f4\u597d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Node.js\u4e2d\uff0c\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u53d6\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u5982\u4f7f\u7528fs\u6a21\u5757\u7684readFileSync\u51fd\u6570\u4ece\/dev\/stdi [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31884","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the 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