{"id":6342,"date":"2023-01-07T12:46:47","date_gmt":"2023-01-07T04:46:47","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=6342"},"modified":"2023-01-07T12:46:47","modified_gmt":"2023-01-07T04:46:47","slug":"%e4%ba%86%e8%a7%a3%e5%a6%82%e4%bd%95%e5%9c%a8node-js%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%b8%b6%e7%bc%93%e5%ad%98%e7%9a%84%e6%b5%81","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/node-js\/%e4%ba%86%e8%a7%a3%e5%a6%82%e4%bd%95%e5%9c%a8node-js%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%b8%b6%e7%bc%93%e5%ad%98%e7%9a%84%e6%b5%81\/","title":{"rendered":"\u4e86\u89e3\u5982\u4f55\u5728Node.js\u4e2d\u4f7f\u7528\u5e36\u7f13\u5b58\u7684\u6d41"},"content":{"rendered":"

<\/p>\n

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Node.js \u662f\u4e00\u500b\u5ee3\u53d7\u6b61\u8fce\u7684 JavaScript \u5e73\u53f0\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u958b\u767c\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\uff0c\u5305\u62ec Web \u548c\u79fb\u52d5\u61c9\u7528\u7a0b\u5e8f\u3002Node.js \u4f7f\u7528\u6d41\u4f86\u64cd\u4f5c\u8cc7\u6599\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u8f15\u9b06\u5730\u8655\u7406\u8cc7\u6599\u3002\u5728 Node.js \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5e36\u6709\u7f13\u5b58\u7684\u6d41\u4f86\u66f4\u6709\u6548\u5730\u8655\u7406\u8cc7\u6599\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728 Node.js \u4e2d\u4f7f\u7528\u5e36\u6709\u7f13\u5b58\u7684\u6d41\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u7f13\u5b58\u6d41\uff1f<\/h2>\n

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\u5982\u4f55\u5728 Node.js \u4e2d\u4f7f\u7528\u7f13\u5b58\u6d41\uff1f<\/h2>\n

\u5728 Node.js \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 stream.Transform<\/code> \u4f86\u5275\u5efa\u7f13\u5b58\u6d41\u3002stream.Transform<\/code> \u662f\u4e00\u500b\u62bd\u8c61\u985e\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u5275\u5efa\u81ea\u5b9a\u7fa9\u7684\u6d41\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u500b _transform()<\/code> \u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u65bc\u5c07\u8cc7\u6599\u5f9e\u8f38\u5165\u6d41\u8f49\u63db\u70ba\u8f38\u51fa\u6d41\u3002<\/p>\n

\u4e0b\u9762\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528 stream.Transform<\/code> \u4f86\u5275\u5efa\u7f13\u5b58\u6d41\uff1a<\/p>\n

\nconst { Transform } = require('stream');\n\nconst cacheStream = new Transform({\n  transform(chunk, encoding, callback) {\n    \/\/ \u5c07\u8cc7\u6599\u5b58\u5132\u5728\u5167\u5b58\u4e2d\n    this.cache = (this.cache || '') + chunk.toString();\n    callback(null, chunk);\n  }\n});\n\n\/\/ \u5c07\u8cc7\u6599\u5beb\u5165\u7f13\u5b58\u6d41\ncacheStream.write('Hello ');\ncacheStream.write('World!');\n\n\/\/ \u5f9e\u7f13\u5b58\u6d41\u4e2d\u8b80\u53d6\u8cc7\u6599\nconsole.log(cacheStream.cache); \/\/ Hello World!\n<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 stream.Transform<\/code> \u4f86\u5275\u5efa\u4e00\u500b\u7f13\u5b58\u6d41\uff0c\u4e26\u5c07\u8cc7\u6599\u5beb\u5165\u7f13\u5b58\u6d41\u3002\u7136\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u5f9e\u7f13\u5b58\u6d41\u4e2d\u8b80\u53d6\u8cc7\u6599\u3002<\/p>\n
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<\/p>\n
\u7e3d\u7d50<\/h2>\n
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