javascript - 简单的 JavaScript : How to invoke a function based off user prompt;

Question

我已经定义了一些函数，并且我想获取用户输入来调用这些函数。我有以下代码，但无法弄清楚当我使用变量时如何调用实际函数。我假设下面的代码可以工作..

谢谢!

var someFunctions = {
  play: function() {
    if (player.stopped()) {
      player.play();
    } else {
      return false;
    }
  }


var getCommand = function(){

  var command = prompt("Please enter a command");

  if (!(command in someFunctions)) {
    alert('command not recognized');
    getCommand();
  } else {
    command();
  }

}

getCommand();

Answer 1

var someFunctions = {
  play: function() {
     if (player.stopped()) {
        player.play();
     } 
     else {
        return false;
     }
  }
};

var getCommand = function(){
   var commandInput = prompt("Please enter a command");
   var command = someFunctions[commandInput];

   if (!command) {
      alert('command not recognized');
      getCommand();
   } 
   else {
      command();
   }
};

getCommand();