从a-z中选择一个随机字母

Question

如何从a-z选择一个随机字母，并将其单独放入标题中的html中，以替换先前存在的任何其他字母？我不知道我做的是否有效。

function randLetter( ) {

var letters =
    ("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q"
    ,"r","s","t","u","v","w","x","y","z");

var letter = letters[Math.floor(Math.random()*letters.length)];

return letter

}

$('#letter').html('letter')

- cparbr

---

应该是 $('#letter').html(randLetter())（不包括引号）。 - Downgoat

Answer 1

大写字母可以使用

String.fromCharCode(65+Math.floor(Math.random() * 26))

对于小写字母

String.fromCharCode(97+Math.floor(Math.random() * 26))

- Praveen Kumar Gulati

Answer 2

请使用以下代码来完成您的工作

function randLetter() {
    var letters = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];
    var letter = letters[Math.floor(Math.random() * letters.length)];
    return letter
}

$('#letter').html(randLetter())

Fiddle

- Mritunjay

Answer 3

如果您想要替换需要更多代码的元素中的随机字母，可以使用以下方法。这将用一个随机字母替换一个随机字符。

function randLetter() {
  var letters = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];
  var letter = letters[Math.floor(Math.random() * letters.length)];
  return letter;
}

var html = $('#letter').html();
var index = Math.floor(Math.random() * html.length);
var char = randLetter();

$('#letter').html(html.substr(0, index) + char + html.substr(index + char.length));

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<span id="letter">ABCDEFGHIJKLMNOPQRSTUVWXYZ</span>

- Downgoat