Node.js argv 教学

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本文介绍了如何在Node.js环境中利用process.argv全局对象来获取和处理命令行参数。通过示例代码展示了如何定义和捕获特定标志（flag），并根据这些参数执行相应的逻辑。文章强调了正确理解和使用argv的重要性。

Process Object is a global object,

IO/EO, EXECUTE

ALL THOSE ARGUMENTS SAVED IN PROCESS.ARGV: Argument Variable To start the process//

console.log(process.argv);

var index = process.argv.indexOf(flag);

argv is an array, contains path to node, and a path to this file

Let s try some code,

function grab(flag) {
  var index = process.argv.indexOf(flag)
  return (index === -1) ? null : process.argv[index + 1]
}

var greeting = grab("--greeting");
var name = grab("--name");

function checkArgv() {

   if(!greeting || !name) {
     var s = "No!"
   }
   else {
     var s = `Welcome ___ ${greeting}, ${name}`
   }
   console.log(s)
}

checkArgv()

You should know how to use the argv!!