看看tj大神的commander.js

https://github.com/visionmedia/commander.js

代码示例

#!/usr/bin/env node

/**
 * Module dependencies.
 */

var program = require('commander');

program
  .version('0.0.1')
  .option('-p, --peppers', 'Add peppers')
  .option('-P, --pineapple', 'Add pineapple')
  .option('-b, --bbq', 'Add bbq sauce')
  .option('-c, --cheese [type]', 'Add the specified type of cheese [marble]', 'marble')
  .parse(process.argv);

console.log('you ordered a pizza with:');
if (program.peppers) console.log('  - peppers');
if (program.pineapple) console.log('  - pineapple');
if (program.bbq) console.log('  - bbq');
console.log('  - %s cheese', program.cheese);

楼上提到的commander是专门用来写CLI的了，如果你只是需要一个专门parse命令行参数的包，可以用substack的optimist: https://npmjs.org/package/optimist

建议楼主多逛逛https://npmjs.org/browse/star
里面库基本都全了

注意在下面的程序是不可少的。 @0x_Jin 你看看这篇文章的写法
http://witcheryne.iteye.com/blog/1196170

#!/usr/bin/env node

var program = require('commander');

function range (val) {
    return val.split('..').map(Number);
}

function list (val) {
    return val.split(',')
}

//定义参数,以及参数内容的描述
program
    .version('0.0.1')
    .usage('[options] [value ...]')
    .option('-m, --message <string>', 'a string argument')
    .option('-i, --integer <n>', 'input a integet argument.', parseInt)
    .option('-f, --float <f>', 'input a float arg', parseFloat)
    .option('-l, --list <items>', 'a list', list)
    .option('-r, --range <a>..<b>', 'a range', range)

//添加额外的文档描述
program.on('help', function() {
    console.log('   Examples:')
    console.log('')
    console.log('       # input string, integer and float')
    console.log('       $ ./nodecmd.js -m \"a string\" -i 1 -f 1.01')
    console.log('')

    console.log('       # input range 1 - 3')
    console.log('       $ ./nodecmd.js -r 1..3')
    console.log('')

    console.log('       # input list: [1,2,3]')
    console.log('       $ ./nodecmd.js -l 1,2,3')
    console.log('')
});

//解析commandline arguments
program.parse(process.argv)

//输出结果
console.info('--messsage:')
console.log(program.message);

console.info('--integer:')
console.log(program.integer)

console.info('--range:')
console.log(program.range)

console.info('--list:')
console.log(program.list)