javascript - 如何从随机字符串中输出单词的第一个、中间和最后一个字母

Question

例如葡萄应该产出gae。如果代码的开头如下所示，

var words = [ "banana", "apple", "pineapple", "orange", "pear", "grape",
  "watermelon",     "paragraph", "Avocado", "cherry", "blackberry", "coconut",
  "lime", "lemon", "olive", "plum",  "Nectarine", "mango", "apricot"];
for (var i = 0; i < 5; i++){ 
  var n1 = Math.floor(rc4Rand.getRandomNumber() * words.length); 
  var word = words[n1]; 
  document.writeln("The word is: " + word); 
  document.writeln("1st, middle and last letters are:"); 
  output(word); 
} 

我应该写一些像数组n1[0]、数组[n1.length-1]、array[length/2]或者得到什么结果？感谢您的所有评论和建议!

Answer 1

类似这样的事情

var shortened = word.charAt(0) + // first
                word.charAt(Math.floor(word.length / 2)) + // middle
                word.charAt(word.length-1); // last

FIDDLE