javascript - JS中不同语言打印 "welcome"

Question

任务是根据所选语言打印一条问候消息。我得到了一个对象文字。例如，如果用户选择“dutch”，程序将打印“Welkom”等。如果未找到语言，程序应打印默认语言，即英语。我已经能够解决大部分问题，除了一件事，现在在当前代码中，当找到一种语言时，它还会用英语打印一条欢迎消息，我错过了什么？

var o = {
  english: 'Welcome',
  czech: 'Vitejte',
  danish: 'Velkomst',
  dutch: 'Welkom',
  estonian: 'Tere tulemast',
  finnish: 'Tervetuloa',
  flemish: 'Welgekomen',
  french: 'Bienvenue',
  german: 'Willkommen',
  irish: 'Failte',
  italian: 'Benvenuto',
  latvian: 'Gaidits',
  lithuanian: 'Laukiamas',
  polish: 'Witamy',
  spanish: 'Bienvenido',
  swedish: 'Valkommen',
  welsh: 'Croeso'
}

function GetLang(arg) {

  for (key in o) {
    if (arg === key) {
      console.log(o[key])
    }
  }
  if (arg !== key) {
    console.log(o.english)
  }

}
GetLang('danish');

Answer 1

您可以直接使用参数arg，并用它来检查该属性是否在数组中。然后您将获得该值，否则您将获得 english 属性的值。

return o[arg] || o.english;

var o = {
         english: 'Welcome',
         czech: 'Vitejte',
         danish: 'Velkomst',
         dutch: 'Welkom',
         estonian: 'Tere tulemast',
         finnish: 'Tervetuloa',
         flemish: 'Welgekomen',
         french: 'Bienvenue',
         german: 'Willkommen',
         irish: 'Failte',
         italian: 'Benvenuto',
         latvian: 'Gaidits',
         lithuanian: 'Laukiamas',
         polish: 'Witamy',
         spanish: 'Bienvenido',
         swedish: 'Valkommen',
         welsh: 'Croeso'
    };

function GetLang(arg) {
    return o[arg] || o.english;
}

console.log(GetLang('danish'));