yargs用于方便的处理命令行参数。导入yargs包,在项目路径下:
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> npm install --save yargs
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原始文件
app.js:
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const yargs = require('yargs'); console.log('Start app.');
console.log(process.argv);
console.log('yargs',yargs.argv);
var command = process.argv[2];
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获取用户输入
打开控制台,在当前目录下输入:
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> node app.js remove --title="buy book"
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输出字符串
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Start app. [ '/Users/jackson/.nvm/versions/node/v10.13.0/bin/node', '/Users/jackson/Desktop/compaign/app.js', 'remove', '--title=buy book' ] yargs { _: [ 'remove' ], title: 'buy book', '$0': 'app.js' } Remove node
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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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notes.js:
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console.log('start nodes.js');
var addNote = (title,body)=>{ console.log('Adding note',title,body); }
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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测试
打开控制台,在当前目录下输入:
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> node app.js remove --title="buy book"
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输出字符串:
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start nodes.js Start app. [ '/Users/jackson/.nvm/versions/node/v10.13.0/bin/node', '/Users/jackson/Desktop/compaign/app.js', 'remove', '--title=buy book' ] yargs { _: [ 'remove' ], title: 'buy book', '$0': 'app.js' } Removing note buy book
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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 book" --body="jonson"
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输出字符串:
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start nodes.js Start app. [ '/Users/jackson/.nvm/versions/node/v10.13.0/bin/node', '/Users/jackson/Desktop/compaign/app.js', 'add', '--title=buy book', '--body=jonson' ] yargs { _: [ 'add' ], title: 'buy book', body: 'jonson', '$0': 'app.js' } Adding note buy book jonson
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