Question

E.g。葡萄应该输出gae。如果代码的开头看起来像这样，

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); 
}

我应该写像数组n1[0]，数组[n1.length-1]，array[length/2]或者得到什么结果？请提出您的所有意见和建议！

Answer 1

像这样的东西

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

FIDDLE

Answer 2

var string = "random string";

var fml; // first middle last
fml = string[0] + string[Math.floor(string.length / 2)] + string[string.length - 1];
// gives "r g"

您可能希望在string上添加一些检查。如果它是一个空字符串，这将失败。它会短于2个字符，你会得到重复。如果你想绕过另一条路（对于长度均匀的字符串），你也可以用Math.floor替换Math.ceil。

如何从随机字符串输出单词的第一个，中间和最后一个字母

2 个答案: