{"id":187,"date":"2021-02-10T10:06:40","date_gmt":"2021-02-10T02:06:40","guid":{"rendered":"http:\/\/gjweb.top\/?p=187"},"modified":"2021-02-10T10:06:41","modified_gmt":"2021-02-10T02:06:41","slug":"node%e4%b8%ad%e7%9a%84%e6%96%87%e4%bb%b6%e6%93%8d%e4%bd%9c%e8%af%bb%e5%8f%96","status":"publish","type":"post","link":"https:\/\/gjweb.top\/?p=187","title":{"rendered":"node\u4e2d\u7684\u6587\u4ef6\u64cd\u4f5c(\u8bfb\u53d6)"},"content":{"rendered":"\n<p>\u7b80\u5355\u8bfb\u53d6\u65b9\u5f0f<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*<br>    fs.readFile(path[,options],callback){<br>        path \u8981\u8bfb\u53d6\u6587\u4ef6\u7684\u8def\u5f84 + \u6587\u4ef6\u540d + \u540e\u7f00<br>        options: \u914d\u7f6e\u5bf9\u8c61<br>        callback \u56de\u8c03<br>            err \u9519\u8bef\u5bf9\u8c61<br>            data \u8bfb\u53d6\u51fa\u6765\u7684\u6570\u636e<br>    }<br>*\/<br>let fs = require('fs')<br>fs.readFile(__dirname + '\/demo.text',(err,data)=&gt;{<br> &nbsp; &nbsp;if(err){<br> &nbsp; &nbsp; &nbsp; &nbsp;console.log(err)<br> &nbsp;  }else{<br> &nbsp; &nbsp; &nbsp; &nbsp;console.log(data)<br> &nbsp; &nbsp; &nbsp; &nbsp;\/\/ \u5199\u5165\u5176\u4ed6\u6587\u4ef6<br> &nbsp; &nbsp; &nbsp; &nbsp;fs.writeFile(\"..\/haha.text\",data,(err)=&gt;{<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if(err) console.log(err)<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;else console.log(\"\u6587\u4ef6\u5199\u5165\u6210\u529f\")<br> &nbsp; &nbsp; &nbsp;  })<br> &nbsp;  }<br>})<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>\u7b80\u5355\u8bfb\u5199\u6d41\u7a0b<ul><li>\u9996\u5148\u5c06\u5168\u90e8\u6587\u4ef6\u8bfb\u5230\u5185\u5b58\u4e2d<\/li><li>\u7136\u540e\u5728\u5199\u5165\u786c\u76d8\u4e2d<\/li><li>\u7f3a\u70b9<ul><li>\u5982\u679c\u6587\u4ef6\u8fc7\u5927\u8d85\u8fc7\u5185\u5b58\u5bb9\u91cf\u4f1a\u4ea7\u751f\u5185\u5b58\u6ea2\u51fa<\/li><li>\u5982\u679c\u5199\u5165\u8d85\u51fa\u786c\u76d8\u6700\u5927<\/li><\/ul><\/li><\/ul><\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u6d41\u5f0f\u8bfb\u53d6\u65b9\u5f0f<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*<br>    fs.createReadStream(path[,options]){<br>        path \u6587\u4ef6\u8def\u5f84+\u6587\u4ef6\u540d+\u540e\u7f00<br>        option<br>            flags<br>            encoding<br>            fd<br>            mode<br>            autoClose<br>            emitclose<br>            start \u8d77\u59cb\u504f\u79fb\u91cf<br>            end \u7ed3\u675f\u504f\u79fb\u91cf<br>            highWatermark  \u6bcf\u6b21\u8bfb\u53d6\u6570\u636e\u7684\u5927\u5c0f,\u9ed8\u8ba4\u503c\u662f64*1024<br>    }<br>*\/<br>let fs = require(\"fs\");<br>\/\/ \u521b\u5efa\u4e00\u4e2a\u53ef\u8bfb\u6d41<br>let rs = fs.createReadStream(__dirname + \"\/test.mp4\/\")<br>\/\/ \u521b\u5efa\u4e00\u4e2a\u53ef\u5199\u6d41<br>let ws = fs.createWirteStream(\"..\/haha.mp4\")<br>\/\/ \u53ea\u8981\u7528\u5230\u4e86\u6d41,\u5c31\u5fc5\u987b\u76d1\u542c\u6d41\u7684\u72b6\u6001<br>rs.on(\"open\",function(){<br> &nbsp; &nbsp;console.log('\u53ef\u8bfb\u6d41\u6253\u5f00\u4e86')<br>})<br>rs.on('close',function(){<br> &nbsp; &nbsp;console.log('\u53ef\u8bfb\u6d41\u5173\u95ed\u4e86');<br> &nbsp; &nbsp;ws.close() \/\/ \u5f53\u8bfb\u6d41\u5b8c\u6210\u540e,\u5173\u95ed\u53ef\u5199\u6d41<br>})<br>ws.on(\"open\",function(){<br> &nbsp; &nbsp;console.log('\u53ef\u5199\u6253\u5f00\u4e86')<br>})<br>ws.on('close',function(){<br> &nbsp; &nbsp;console.log('\u53ef\u5199\u6d41\u5173\u95ed\u4e86')<br>})<br>\/\/ \u7ed9\u53ef\u8bfb\u6d41\u7ed1\u5b9a\u4e00\u4e2adata,\u5c31\u4f1a\u89e6\u53d1\u53ef\u8bfb\u6d41\u81ea\u52a8\u8bfb\u53d6\u5185\u5bb9<br>let result = rs.on(\"data\",function(data){<br> &nbsp; &nbsp;\/\/ Buffer\u5b9e\u4f8b\u7684length\u5c5e\u6027,\u662f\u8868\u793a\u8be5Buffer\u5b9e\u4f8b\u5360\u7528\u5185\u5b58\u7a7a\u95f4\u7684\u5927\u5c0f<br> &nbsp; &nbsp;console.loga(data.length) \/\/ \u8868\u793a\u6587\u4ef6\u7684\u5927\u5c0f<br> &nbsp; &nbsp;ws.wrirte(data)<br>})<br>\u200b<br>\u200b<br>\u200b<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u7b80\u5355\u8bfb\u53d6\u65b9\u5f0f \/* fs.readFile(path[,options],callback){ path \u8981\u8bfb [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-187","post","type-post","status-publish","format-standard","hentry","category-node"],"_links":{"self":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/187","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=187"}],"version-history":[{"count":0,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/187\/revisions"}],"wp:attachment":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}