Node.jsとJavaScriptの学習(9日目)

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node.js js テキストリンク

#9日目2021.06.29

  • すべての学習内容は「生活コード>WEB>WEB 2-Node。js」の授業内容に基づいて整理されている.
  • [カリキュラムのソースコードを確認]

    • [Node.js]

  • オブジェクトを使用してテンプレートを整理する機能
    オブジェクト化によって再構築されます.templateHTML、templatelist関数をtemplateにオブジェクト化します.
    • var http = require('http');
var fs = require('fs');
var url = require('url');
var qs = require('querystring');
 
var template = {
  HTML:function(title, list, body, control){
    return `
    <!doctype html>
    <html>
    <head>
      <title>WEB1 - ${title}</title>
      <meta charset="utf-8">
    </head>
    <body>
      <h1><a href="/">WEB</a></h1>
      ${list}
      ${control}
      ${body}
    </body>
    </html>
    `;
  },list:function(filelist){
    var list = '<ul>';
    var i = 0;
    while(i < filelist.length){
      list = list + `<li><a href="/?id=${filelist[i]}">${filelist[i]}</a></li>`;
      i = i + 1;
    }
    list = list+'</ul>';
    return list;
  }
}
 
var app = http.createServer(function(request,response){
    var _url = request.url;
    var queryData = url.parse(_url, true).query;
    var pathname = url.parse(_url, true).pathname;
    if(pathname === '/'){
      if(queryData.id === undefined){
        fs.readdir('./data', function(error, filelist){
          var title = 'Welcome';
          var description = 'Hello, Node.js';
          var list = template.list(filelist);
          var html = template.HTML(title, list,
            `<h2>${title}</h2>${description}`,
            `<a href="/create">create</a>`
          );
          response.writeHead(200);
          response.end(html);
        });
      } else {
        fs.readdir('./data', function(error, filelist){
          fs.readFile(`data/${queryData.id}`, 'utf8', function(err, description){
            var title = queryData.id;
            var list = template.list(filelist);
            var html = template.HTML(title, list,
              `<h2>${title}</h2>${description}`,
              ` <a href="/create">create</a>
                <a href="/update?id=${title}">update</a>
                <form action="delete_process" method="post">
                  <input type="hidden" name="id" value="${title}">
                  <input type="submit" value="delete">
                </form>`
            );
            response.writeHead(200);
            response.end(html);
          });
        });
      }
    } else if(pathname === '/create'){
      fs.readdir('./data', function(error, filelist){
        var title = 'WEB - create';
        var list = template.list(filelist);
        var html = template.HTML(title, list, `
          <form action="/create_process" method="post">
            <p><input type="text" name="title" placeholder="title"></p>
            <p>
              <textarea name="description" placeholder="description"></textarea>
            </p>
            <p>
              <input type="submit">
            </p>
          </form>
        `, '');
        response.writeHead(200);
        response.end(html);
      });
    } else if(pathname === '/create_process'){
      var body = '';
      request.on('data', function(data){
          body = body + data;
      });
      request.on('end', function(){
          var post = qs.parse(body);
          var title = post.title;
          var description = post.description;
          fs.writeFile(`data/${title}`, description, 'utf8', function(err){
            response.writeHead(302, {Location: `/?id=${title}`});
            response.end();
          })
      });
    } else if(pathname === '/update'){
      fs.readdir('./data', function(error, filelist){
        fs.readFile(`data/${queryData.id}`, 'utf8', function(err, description){
          var title = queryData.id;
          var list = template.list(filelist);
          var html = template.HTML(title, list,
            `
            <form action="/update_process" method="post">
              <input type="hidden" name="id" value="${title}">
              <p><input type="text" name="title" placeholder="title" value="${title}"></p>
              <p>
                <textarea name="description" placeholder="description">${description}</textarea>
              </p>
              <p>
                <input type="submit">
              </p>
            </form>
            `,
            `<a href="/create">create</a> <a href="/update?id=${title}">update</a>`
          );
          response.writeHead(200);
          response.end(html);
        });
      });
    } else if(pathname === '/update_process'){
      var body = '';
      request.on('data', function(data){
          body = body + data;
      });
      request.on('end', function(){
          var post = qs.parse(body);
          var id = post.id;
          var title = post.title;
          var description = post.description;
          fs.rename(`data/${id}`, `data/${title}`, function(error){
            fs.writeFile(`data/${title}`, description, 'utf8', function(err){
              response.writeHead(302, {Location: `/?id=${title}`});
              response.end();
            })
          });
      });
    } else if(pathname === '/delete_process'){
      var body = '';
      request.on('data', function(data){
          body = body + data;
      });
      request.on('end', function(){
          var post = qs.parse(body);
          var id = post.id;
          fs.unlink(`data/${id}`, function(error){
            response.writeHead(302, {Location: `/`});
            response.end();
          })
      });
    } else {
      response.writeHead(404);
      response.end('Not found');
    }
});
app.listen(3000);

    main.js運転結果


    コードの複雑さを低減するために再構成を行うため,実行結果は元の結果と同じである.
  • モジュールのフォーマットについて
    モジュールはコードを整理する最大のツール形式です.
    • mpart.js
    var M = {
    v:'v',
    f:function(){
        console.log(this.v);
    }
}

module.exports = M;
    module.exportsは、複数の機能のmpartです.jsファイルに加えて、オブジェクトの約束をエクスポートすることもできます.
    muse.js
    var part = require('./mpart.js');

part.f();

    muse.js運転結果



    利用して学ぶ

  • モジュールモジュールモジュールモジュール化テンプレート機能
    • を使用する.
    この投稿の上部にオブジェクト化されたtemplateがモジュール化されます.

    template.js

    module.exports = {
    HTML:function(title, list, body, control){
      return `
      <!doctype html>
      <html>
      <head>
        <title>WEB1 - ${title}</title>
        <meta charset="utf-8">
      </head>
      <body>
        <h1><a href="/">WEB</a></h1>
        ${list}
        ${control}
        ${body}
      </body>
      </html>
      `;
    },list:function(filelist){
      var list = '<ul>';
      var i = 0;
      while(i < filelist.length){
        list = list + `<li><a href="/?id=${filelist[i]}">${filelist[i]}</a></li>`;
        i = i + 1;
      }
      list = list+'</ul>';
      return list;
    }
  }
    main.jsでオブジェクトを削除するとvar template=require(./lib/template.js);に変更します.
    main.js
    var http = require('http');
var fs = require('fs');
var url = require('url');
var qs = require('querystring');
var template = require('./lib/template.js');
 
var app = http.createServer(function(request,response){
    var _url = request.url;
    var queryData = url.parse(_url, true).query;
    var pathname = url.parse(_url, true).pathname;
    if(pathname === '/'){
      if(queryData.id === undefined){
        fs.readdir('./data', function(error, filelist){
          var title = 'Welcome';
          var description = 'Hello, Node.js';
          var list = template.list(filelist);
          var html = template.HTML(title, list,
            `<h2>${title}</h2>${description}`,
            `<a href="/create">create</a>`
          );
          response.writeHead(200);
          response.end(html);
        });
      } else {
        fs.readdir('./data', function(error, filelist){
          fs.readFile(`data/${queryData.id}`, 'utf8', function(err, description){
            var title = queryData.id;
            var list = template.list(filelist);
            var html = template.HTML(title, list,
              `<h2>${title}</h2>${description}`,
              ` <a href="/create">create</a>
                <a href="/update?id=${title}">update</a>
                <form action="delete_process" method="post">
                  <input type="hidden" name="id" value="${title}">
                  <input type="submit" value="delete">
                </form>`
            );
            response.writeHead(200);
            response.end(html);
          });
        });
      }
    } else if(pathname === '/create'){
      fs.readdir('./data', function(error, filelist){
        var title = 'WEB - create';
        var list = template.list(filelist);
        var html = template.HTML(title, list, `
          <form action="/create_process" method="post">
            <p><input type="text" name="title" placeholder="title"></p>
            <p>
              <textarea name="description" placeholder="description"></textarea>
            </p>
            <p>
              <input type="submit">
            </p>
          </form>
        `, '');
        response.writeHead(200);
        response.end(html);
      });
    } else if(pathname === '/create_process'){
      var body = '';
      request.on('data', function(data){
          body = body + data;
      });
      request.on('end', function(){
          var post = qs.parse(body);
          var title = post.title;
          var description = post.description;
          fs.writeFile(`data/${title}`, description, 'utf8', function(err){
            response.writeHead(302, {Location: `/?id=${title}`});
            response.end();
          })
      });
    } else if(pathname === '/update'){
      fs.readdir('./data', function(error, filelist){
        fs.readFile(`data/${queryData.id}`, 'utf8', function(err, description){
          var title = queryData.id;
          var list = template.list(filelist);
          var html = template.HTML(title, list,
            `
            <form action="/update_process" method="post">
              <input type="hidden" name="id" value="${title}">
              <p><input type="text" name="title" placeholder="title" value="${title}"></p>
              <p>
                <textarea name="description" placeholder="description">${description}</textarea>
              </p>
              <p>
                <input type="submit">
              </p>
            </form>
            `,
            `<a href="/create">create</a> <a href="/update?id=${title}">update</a>`
          );
          response.writeHead(200);
          response.end(html);
        });
      });
    } else if(pathname === '/update_process'){
      var body = '';
      request.on('data', function(data){
          body = body + data;
      });
      request.on('end', function(){
          var post = qs.parse(body);
          var id = post.id;
          var title = post.title;
          var description = post.description;
          fs.rename(`data/${id}`, `data/${title}`, function(error){
            fs.writeFile(`data/${title}`, description, 'utf8', function(err){
              response.writeHead(302, {Location: `/?id=${title}`});
              response.end();
            })
          });
      });
    } else if(pathname === '/delete_process'){
      var body = '';
      request.on('data', function(data){
          body = body + data;
      });
      request.on('end', function(){
          var post = qs.parse(body);
          var id = post.id;
          fs.unlink(`data/${id}`, function(error){
            response.writeHead(302, {Location: `/`});
            response.end();
          })
      });
    } else {
      response.writeHead(404);
      response.end('Not found');
    }
});
app.listen(3000);

    main.js運転結果


    再構築のためのモジュール化であるため,実行結果は元の結果と同じである.
    スキルツリー
    tf.one_hot符号化の使い方及びone-hot自己符号化