原始文件
app.js:
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const yargs = require('yargs');
const nodes = require('./nodes.js')
console.log('Start app.');
console.log(process.argv);
console.log('yargs',yargs.argv);
const argv = yargs.argv;
var command = process.argv[2];
if(command==='add'){
nodes.addNote(argv.title,argv.body);
}else if(command === 'list'){
nodes.getAll();
}else if(command =='read'){
nodes.getNote(argv.title);
}else if(command=='remove'){
nodes.removeNote(argv.title);
}else{
console.log('command not find');
}
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nodes.js
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console.log('start nodes.js');
const fs = require('fs');
var addNote = (title,body)=>{
var notes = [];
var note = {
title,
body
};
try{
var notesString = fs.readFileSync('notes-data.json');
notes = JSON.parse(notesString);
}catch(e){
}
notes.push(note);
fs.writeFileSync('notes-data.json',JSON.stringify(notes));
}
var getAll = ()=>{
console.log('Get All notes');
};
var getNote = (title)=>{
console.log('getting note',title);
};
var removeNote = (title)=>{
console.log('Removing note',title);
};
module.exports = {
addNote,
getAll,
getNote,
removeNote
};
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打开控制台，在当前目录下输入：
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> node app.js add --title="buy book2" --body="jonson"
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将节点添加到notes-data.json文件中.
再次输入：
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> node app.js add --title="buy book2" --body="jonson"
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notes-data.json:
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[{"title":"buy book2","body":"jonson"},{"title":"buy book2","body":"jonson"}]
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改进 不添加重复的节点
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console.log('start nodes.js');
const fs = require('fs');
var addNote = (title,body)=>{
var notes = [];
var note = {
title,
body
};
try{
var notesString = fs.readFileSync('notes-data.json');
notes = JSON.parse(notesString);
}catch(e){
}
var duplicateNotes = notes.filter((note)=>note.title===title);
if(duplicateNotes.length ===0){
notes.push(note);
fs.writeFileSync('notes-data.json',JSON.stringify(notes));
}
}
var getAll = ()=>{
console.log('Get All notes');
};
var getNote = (title)=>{
console.log('getting note',title);
};
var removeNote = (title)=>{
console.log('Removing note',title);
};
module.exports = {
addNote,
getAll,
getNote,
removeNote
};
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再次输入不会添加节点：
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> node app.js add --title="buy book2" --body="jonson"
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