{"id":165814,"date":"2024-05-08T15:24:01","date_gmt":"2024-05-08T07:24:01","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/165814.html"},"modified":"2024-05-08T15:24:06","modified_gmt":"2024-05-08T07:24:06","slug":"javascript%e4%b8%ad%e5%8f%af%e4%bb%a5%e5%ae%9e%e7%8e%b0%e7%b1%bb%e4%bc%bc%e6%b5%81%e7%9a%84%e4%b8%9c%e8%a5%bf%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/165814.html","title":{"rendered":"javascript\u4e2d\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u4f3c\u6d41\u7684\u4e1c\u897f\u4e48"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26232915\/e15a8dca-fbe5-4508-9dc2-329fb125c496.webp\" alt=\"javascript\u4e2d\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u4f3c\u6d41\u7684\u4e1c\u897f\u4e48\" \/><\/p>\n<p><p>JavaScript \u4e2d\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u4f3c\u6d41\u7684\u4e1c\u897f\uff1a<strong>\u57fa\u4e8e\u4e8b\u4ef6\u7684 Stream\u3001Node.js 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readable\uff08\u53ef\u8bfb\uff09\u3001writable\uff08\u53ef\u5199\uff09\u3001duplex\uff08\u53ef\u8bfb\u5199\u7684\u53cc\u5de5\uff09\u548c transform\uff08\u8f6c\u6362\uff09\u6d41\u3002<\/p>\n<\/p>\n<p><h4>\u53ef\u8bfb\u6d41\uff08Readable\uff09<\/h4>\n<\/p>\n<p><p>\u53ef\u8bfb\u6d41\u662f\u4ece\u7cfb\u7edf\u4e2d\u8bfb\u53d6\u6570\u636e\u7684\u62bd\u8c61\u6982\u5ff5\u3002\u4f8b\u5982\uff0c\u6587\u4ef6\u8bfb\u53d6\u64cd\u4f5c\u53ef\u4ee5\u7528 fs.createReadStream \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u53ef\u8bfb\u6d41\uff0c\u7136\u540e\u901a\u8fc7\u76d1\u542c\u6570\u636e\u4e8b\u4ef6\u6765\u83b7\u53d6\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h4>\u53ef\u5199\u6d41\uff08Writable\uff09<\/h4>\n<\/p>\n<p><p>\u76f8\u5bf9\u7684\uff0c\u53ef\u5199\u6d41\u5219\u662f\u5c06\u6570\u636e\u5199\u5165\u7cfb\u7edf\u7684\u4e00\u79cd\u63a5\u53e3\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a\u901a\u8fc7 fs.createWriteStream 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\u548c done \u5c5e\u6027\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><h4>\u4f7f\u7528 Async Iterators \u5b9e\u73b0\u6d41<\/h4>\n<\/p>\n<p><p>Async Iterators \u5141\u8bb8\u4f60\u5f02\u6b65\u5730\u8fed\u4ee3\u6570\u636e\uff0c\u53ef\u4ee5\u5904\u7406\u5f02\u6b65\u751f\u6210\u7684\u6570\u636e\uff0c\u5982\u6765\u81ea\u7f51\u7edc\u8bf7\u6c42\u7684\u6570\u636e\u6d41\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001WEB API \u4e2d\u7684 STREAM<\/h3>\n<\/p>\n<p><p>\u5728\u73b0\u4ee3\u7684 Web \u6d4f\u89c8\u5668\u4e2d\uff0cFetch API \u63d0\u4f9b\u4e86\u57fa\u4e8e Promise \u7684\u673a\u5236\u6765\u5bf9\u7f51\u7edc\u8bf7\u6c42\u8fdb\u884c\u64cd\u4f5c\uff0c\u5e76\u53ef\u4ee5\u83b7\u53d6\u5230\u4e00\u4e2a ReadableStream \u5bf9\u8c61\u6765\u6309\u9700\u8bfb\u53d6\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h4>Fetch API \u548c ReadableStream<\/h4>\n<\/p>\n<p><p>\u5f53\u4f60\u4f7f\u7528 fetch \u65b9\u6cd5\u53d1\u8d77\u7f51\u7edc\u8bf7\u6c42\u65f6\uff0c\u54cd\u5e94\u5bf9\u8c61\u4e2d\u5305\u542b\u4e86\u4e00\u4e2a body \u5c5e\u6027\uff0c\u5b83\u662f\u4e00\u4e2a ReadableStream\u3002\u8fd9\u4e2a\u6d41\u53ef\u4ee5\u7528\u6765\u6309\u9700\u8bfb\u53d6\u6765\u81ea\u7f51\u7edc\u8bf7\u6c42\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001RXJS \u548c OBSERVABLE STREAM<\/h3>\n<\/p>\n<p><p>RxJS \u662f Reactive Extensions \u7684 JavaScript \u5b9e\u73b0\uff0c\u5b83\u63d0\u4f9b\u4e86 Observable \u7c7b\u578b\u7528\u4e8e\u5904\u7406\u4e8b\u4ef6\u548c\u5f02\u6b65\u7f16\u7a0b\u3002Observable \u662f\u6d41\u5f0f\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5\uff0c\u5141\u8bb8\u4f60\u8ba2\u9605\u548c\u5904\u7406\u6570\u636e\u6d41\uff0c\u7ba1\u7406\u4e8b\u4ef6\u5e8f\u5217\u3002<\/p>\n<\/p>\n<p><h4>Observable \u548c\u64cd\u4f5c\u6d41\u6570\u636e<\/h4>\n<\/p>\n<p><p>Observable \u63d0\u4f9b\u4e86\u4e00\u4e2a\u8ba2\u9605\u63a5\u53e3\uff0c\u4f60\u53ef\u4ee5\u5b9a\u4e49\u54cd\u5e94\u6570\u636e\u7684\u51fd\u6570\uff0c\u5e76\u63a7\u5236\u4e8b\u4ef6\u5982\u4f55\u4f20\u9012\u548c\u8f6c\u6362\u3002RxJS 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