javascript - 从单词数组中选择一个随机单词

Question

我正在研究以下程序。我的任务是将程序设置为选择一个随机词，这样用户就可以猜到我添加了以下 math.random() 方法，但它在这里不起作用是代码:

var words_to_be_guessed = ["VIENNA", "HELSINKI", "COPENHAGEN",
                           "LONDON", "BERLIN", "AMSTERDAM"] ;

// here is what I added
var words_to_be_guessedd = words_to_be_guessed[Math.floor(Math.random()*words_to_be_guessed.lenght)];

var guessed_characters = [ '-', '-', '-', '-', '-', '-', '-', '-', '-', '-',
                           '-', '-', '-', '-', '-', '-', '-', '-', '-', '-',
                           '-', '-', '-', '-', '-', '-', '-', '-', '-', '-' ] ;

guessed_characters = guessed_characters.slice(0, word_to_be_guessed.length);

function string_array_to_string(given_array_of_strings){
   var string_to_return = "";
   for (string_index in given_array_of_strings){
      string_to_return = string_to_return + given_array_of_strings[string_index];
   }
   return string_to_return;
}

我明白了:

Answer 1

除了 length 中的拼写错误外，这一行中还有一个拼写错误:

guessed_characters = guessed_characters.slice(0, word_to_be_guessed.length);

应该是:

guessed_characters = guessed_characters.slice(0, words_to_be_guessed.length);
                                                     ^

此外，构建所需长度的破折号数组的更简单方法是:

Array(5).join('-').split('');

(其中 5 是所需的长度，在您的情况下，word_to_be_guessed.length)
解释:

Array(5)      // Create an array with 5 `undefined` elements. Result: [undefined, undefined, undefined, undefined, undefined];
  .join('-')  // Join these empty elements with a dash.       Result: "-----";
  .split(''); // Split this string at every character.        Result: ["-", "-", "-", "-;"]